djiuser_STC... Posted at 5-14 09:09
I had previously only noticed this behavior with the motion controller and goggles, but I have now also been able to detect it with the RC-N2 transmitter.

Hi. Did you notice it using motion controller and goggles on the mini 4? Or m3p?

My new Mini 4 Pro does exactly what is in some of the videos posted earlier. I gotta admit, it's leaving a bad taste in my mouth and I feel like a return for refund is what I will do considering how long ago this problem was reported to DJI and still not fixed (not even an official acknowledgement of its existence and a "we're working hard to fix it"). Not going to waste time figuring out how to provide logs, clearly DJI could easily reproduce this problem by just opening a few boxes and flying it themselves.

DroneAreMeh Posted at 7-14 11:20
Not going to waste time figuring out how to provide logs,

educating yourself is rarely wasted time but it's your choice ......

Sean-bumble-bee Posted at 7-14 11:53
educating yourself is rarely wasted time but it's your choice ......

In this instance, it's a waste of time. Figuring out the process of getting logs off a drone i am going to return is hardly "education" in any meaningful sense.

Did you have anything relevant to say about the actual topic of this drone oscillating like a low-rider?

DroneAreMeh Posted at 7-14 18:27
Did you have anything relevant to say about the actual topic of this drone oscillating like a low-rider?

Perhaps you should read the thread and find out lol.

Then again, I could ask, what have you contributed to the thread other than making yourself look like a child throwing a temper tantrum and spitting out their pacifier ? Or did you just come to rant ?

Hi all, I've had exactly the same issue yesterday, with my mini4pro bought last october. I use standard battery since I'm in EASA country, and I saw it because I was flying very near to me, at say 20-25 meters. She was coming towards me and I noticed a very strange motor sound. When the drone was abeam my friend ad me saw she was wobbling back and forth very noticeably, say a 45°-60° oscillations. Only way to stop this was to ease on the forward control stick.
Then we tried same flight with my friend's mini4pro, and we got exactly the same oscillations.
Please let me know if it's best to open an issue with dji, sending our logs.
Best regards
Francesco from Rome - Italy

Francesco62 Posted at 7-15 02:23
Hi all, I've had exactly the same issue yesterday, with my mini4pro bought last october. I use standard battery since I'm in EASA country, and I saw it because I was flying very near to me, at say 20-25 meters. She was coming towards me and I noticed a very strange motor sound. When the drone was abeam my friend ad me saw she was wobbling back and forth very noticeably, say a 45°-60° oscillations. Only way to stop this was to ease on the forward control stick.
Then we tried same flight with my friend's mini4pro, and we got exactly the same oscillations.
Please let me know if it's best to open an issue with dji, sending our logs.

Hi. Please send your logs and I will update the first post with all the collected data so far and logs to help DJI analyze this issue. You can contact support as well, but some other pilots reported that their replacement drone has the same issue.

Tuxtard Posted at 7-15 02:30
Hi. Please send your logs and I will update the first post with all the collected data so far and logs to help DJI analyze this issue. You can contact support as well, but some other pilots reported that their replacement drone has the same issue.

Please send your logs and I will update the first post with all the collected data so far and logs to help DJI analyze this issue.
It was rightly said, DJI does not need our logs, they just need to take any of their drones, get a problem and look at the logs...

You can add me to the list of Mini 4 Pros that have the oscillation problem. I now keep the compass open all the time watching for the oscillation on the attitude indicator. Usually a quick increase or decrease in altitude will stop it, until it returns again. I have problems mostly when above 20 mph. If it persists I'll drop my speed to around 15 mph and it doesn't seem to happen for me. Also it doesn't matter if it is windy or calm.

DJI In The Sky Posted at 7-15 11:57
You can add me to the list of Mini 4 Pros that have the oscillation problem. I now keep the compass open all the time watching for the oscillation on the attitude indicator. Usually a quick increase or decrease in altitude will stop it, until it returns again. I have problems mostly when above 20 mph. If it persists I'll drop my speed to around 15 mph and it doesn't seem to happen for me. Also it doesn't matter if it is windy or calm.

posting flight logs might be of some use.

Sean-bumble-bee Posted at 7-15 12:20
posting flight logs might be of some use.

This is really a bug that DJI should fix, it’s surprising that they don’t respond here to posts describing the problem, they’re just silent - no recognition, no time frame for the loss. Probably bots don’t know how to recognize problems...

Yes, it's really a shame that DJI doesn't comment on this issue here in the forum. They should already have enough logs and as another user correctly wrote, they would simply have to fly any Mini 4 pro themselves for a few minutes and could observe the problem and then analyze it. But unfortunately there is no statement about this problem. When you consider that you spent more than 1,000 euros on this drone, it's very sad!

FJI seems to be of the opinion that as long as the drone doesn't crash, everything is fine.

I sure wish DJI would provide an update on this issue and when it will be fixed!

Hard to say if its actually fixed this time, but after I installed 1.13.10 on my Mini 4/RC2 combo, I haven't seen it doing the wave. Time will tell, as I only have a couple flights on in calm conditions it since the update and its usually a windy day that gets it waving. Its almost like its a learned behavior, lol...

Manitobahunter Posted at 7-22 22:19
Hard to say if its actually fixed this time, but after I installed 1.13.10 on my Mini 4/RC2 combo, I haven't seen it doing the wave. Time will tell, as I only have a couple flights on in calm conditions it since the update and its usually a windy day that gets it waving. Its almost like its a learned behavior, lol...

Try sport mode and full throttle, mine starts shaking in such cases, doesn't matter wind or no wind. I need to stop or disable cruise control and start again and it's ok. It happens when motors are on a full load, either full throttle or good wind to make them load

Hi, I managed to reproduce the problem with motion controller 2 just by swinging up and down (I can reproduce it as many time as I want). Any time I do it, the drone oscillates like it’s going to fail soon.

If someone wants the log files I can send it if it helps any how.

Sean-bumble-bee Posted at 7-15 12:20
posting flight logs might be of some use.

Hi. I have them. What will you do with it?

Fabio Ramos Posted at 7-23 12:48
Hi, I managed to reproduce the problem with motion controller 2 just by swinging up and down (I can reproduce it as many time as I want). Any time I do it, the drone oscillates like it’s going to fail soon.

If someone wants the log files I can send it if it helps any how.

Yes, please provide the .txt log file.

BudWalker Posted at 7-23 12:51
Yes, please provide the .txt log file.

Hi. I have only able to get the .dat log file from the goggles. It has 1.4 Gb

Fabio Ramos Posted at 7-23 12:53
Hi. I have only able to get the .dat log file from the goggles. It has 1.4 Gb

The .DAT will be encrypted so won't be useable. If you can get the .DAT you should also be able to the .txt log file. Take a look at these instructions
https://fpvdronepilots.com/threads/dat-available.4225/#post-35016

Although it describes the process for retrieving the FPV and Avata log files the process is the same since the log files reside on the goggles.

Fabio Ramos Posted at 7-23 12:50
Hi. I have them. What will you do with it?

If you get the .txt flight log upload it to
https://www.phantomhelp.com/LogViewer/Upload/
then post the URL here please.

BudWalker Posted at 7-23 13:27
The .DAT will be encrypted so won't be useable. If you can get the .DAT you should also be able to the .txt log file. Take a look at these instructions
https://fpvdronepilots.com/threads/dat-available.4225/#post-35016

BudWalker, could you have a look at the logs in
https://forum.dji.com/forum.php? ... p;page=1#pid3372145
please ?
Two separate drones. posts 20 & 23

Sean-bumble-bee Posted at 7-23 15:41
BudWalker, could you have a look at the logs in
https://forum.dji.com/forum.php?mod=viewthread&tid=314929&page=1#pid3372145
please ?

I had already taken a look but came to the conclusion I couldn't add much to what you have already observed.

BudWalker Posted at 7-24 06:18
I had already taken a look but came to the conclusion I couldn't add much to what you have already observed.

Great, thanks, I didn't screw up then, lol.

I'm willing to bet this happens often to every single Mini 4 Pro but people don't notice it when it's not close enough easily see/hear (and it makes an awful noise while oscillating) because of gimbal stabilization. BUT, if you ever fly in fpv mode or use the goggles with fpv mode now that goggles are compatible it's completely unacceptable no matter how far away it is. The other day I was using goggles when it started and my instant reaction was to think I hit something, but then I realized I was far above the nearest/tallest tree. DJI, fix this already! There is something seriously wrong with the avionics/PID! You have enough reports and evidence, this is easily reproducible if you just take a few Mini 4 Pros off the warehouse shelf and fly them for a single battery!

DroneAreMeh Posted at 7-24 14:29
I'm willing to bet this happens often to every single Mini 4 Pro but people don't notice it when it's not close enough easily see/hear (and it makes an awful noise while oscillating) because of gimbal stabilization. BUT, if you ever fly in fpv mode or use the goggles with fpv mode now that goggles are compatible it's completely unacceptable no matter how far away it is. The other day I was using goggles when it started and my instant reaction was to think I hit something, but then I realized I was far above the nearest/tallest tree. DJI, fix this already! There is something seriously wrong with the avionics/PID! You have enough reports and evidence, this is easily reproducible if you just take a few Mini 4 Pros off the warehouse shelf and fly them for a single battery!

IMO the easiest way to replicate the problem is sport mode and full throttle for 500-700m... And it happens most of the time, that's why I think, either OA disturbed or current to motors not constant

Sean-bumble-bee Posted at 7-23 15:36
If you get the .txt flight log upload it to
https://www.phantomhelp.com/LogViewer/Upload/
then post the URL here please.

Hi Here they are.

Note 1. I’m using motion controller 2 and goggles 2
Note 2. Pay attention only when flying in a straight line. I did lots of short passage to be on LOS.
https://www.phantomhelp.com/logv ... OI9NQWO62C39MJ2FH6X

https://www.phantomhelp.com/logv ... JO883CKOYI3U0ZZXCDX  (look for the last minutes of flight).

Fabio Ramos Posted at 7-25 05:02
Hi Here they are.

Note 1. I’m using motion controller 2 and goggles 2

Oscillations in the logs you provided are as clear as day. Let's take a look at the second log you provided and focus on the timeline range from 134 to 152 seconds.



Here, we see 2.5 - 3 Hz oscillations for up to a 50 degree pitch angle that last 18 seconds. No natural conditions are able to produce such consistent oscillations for up to 20 seconds.

Fabio Ramos Posted at 7-25 05:02
Hi Here they are.

Note 1. I’m using motion controller 2 and goggles 2

Yikes !
Could you perhaps make the original airdata pages public ? Or upload the original .txt  flightlogs to Phantomhelp  and post their URLs here?
Those logs possibly have the names
DJIFlightRecord_2024-07-20_[13-00-20].txt   
and
DJIFlightRecord_2024-07-24_[21-52-xy].txt

Sean-bumble-bee Posted at 7-25 07:08
Yikes !
Could you perhaps make the original airdata pages public ? Or upload the original .txt  flightlogs to Phantomhelp  and post their URLs here?
Those logs possibly have the names

Hi. Please take it from my drive. (Removed)

Fabio Ramos Posted at 7-25 08:28
Hi. Please take it from my drive. (after you download it I'll remove the files).

I added I added both .txt and .csv files.

Got them thanks

Sean-bumble-bee Posted at 7-25 08:45
Got them thanks

Nice. What are you going to do with this logs? Can you send to some DJI engineer?

Tuxtard Posted at 7-25 06:35
Oscillations in the logs you provided are as clear as day. Let's take a look at the second log you provided and focus on the timeline range from 134 to 152 seconds.

[view_image]

Yes. But what can we do more than posting the logs here?

Fabio Ramos Posted at 7-25 10:45
Nice. What are you going to do with this logs? Can you send to some DJI engineer?

DJI would ignore any logs that I sent concerning someone else's drone, I thought there might be additional information them but I don't see anything.

Sean-bumble-bee Posted at 7-25 11:29
DJI would ignore any logs that I sent concerning someone else's drone, I thought there might be additional information them but I don't see anything.

so ... it's no sense posting the logs here...

DroneAreMeh Posted at 7-24 14:29
I'm willing to bet this happens often to every single Mini 4 Pro but people don't notice it when it's not close enough easily see/hear (and it makes an awful noise while oscillating) because of gimbal stabilization. BUT, if you ever fly in fpv mode or use the goggles with fpv mode now that goggles are compatible it's completely unacceptable no matter how far away it is. The other day I was using goggles when it started and my instant reaction was to think I hit something, but then I realized I was far above the nearest/tallest tree. DJI, fix this already! There is something seriously wrong with the avionics/PID! You have enough reports and evidence, this is easily reproducible if you just take a few Mini 4 Pros off the warehouse shelf and fly them for a single battery!

Do you use motion 3 and Goggles 3 (from Avata 2)?

Fabio Ramos Posted at 7-25 11:57
so ... it's no sense posting the logs here...

it builds up a library of incidents with the evidence to back that up and, in some case, the log readers here or on mavicpilots have given the poster a diagnosis that has enabled the poster to successfully 'debate' with DJI the cause of an incident or gain an understanding of what went on.

Dang.

Had this happen to my Mini4 for the first time today.  
I have a fair number of hours on this unit - - - > Has seen regular usage since last November.

Definitely seemed like a PID tuning issue to me.  Flying straight and level with plus battery, it was clearly exhibiting exhibiting a stable oscillation characteristic of either slightly too much gain or reset in the tuning.  Not too much to create unstable increasing amplitude; but high enough to prevent a decay in oscillation amplitude.Large speed change (i.e. slowing) the drone seemed to restore normal operation for a bit - - -as one would expect with an unstable control loop.

I did not have lots of time to test, but I do not discount a"wind" or "Obstacle avoidance" issue.
I had gone through most of the battery flying fairly high and fairly far from homepoint.
The porpoising was noted at the end of the flight (tooling around homepoint to drain the battery) when flying straight, fast, and level in "N" mode at about 5-10m altitude, with obstacles 10-20m to the left and right.  Wind was higher than I typically fly; and I was getting wind warnings when flying above trees at 100-120m. I was flying an Avata 2 as well. . . .and that craft was NOTABLY struggling with the wind (as evidenced by large pitch evident in the camera view, plus the HMI warnings)

May or may not have a chance to fly tomorrow.  (need to work to afford the next set of drones)

Fabio Ramos Posted at 7-25 12:04
Do you use motion 3 and Goggles 3 (from Avata 2)?

I have used every combination of RC2 alone, RC2 + Goggles 3, and Motion Controller 3 + Goggles 3. It happens on all of them. It is almost impossible to notice if the gimbal is in follow mode and the drone is very far away. In FPV mode it's incredibly obvious, and extremely startling, and it's obvious if it happens as you fly near/overhead because the sound is very different than just a constant forward flight at a consistent pitch angle.

Hello, DJI, anybody home?!