yesterday i lost my drone. connection between controller and drone was all right. however, it was suddenly changed to bad. drone was coming back to my location which was home location,  and drone never came to me.

i have been thinking and thinkig, but i could not find out why drone disappeared and never come back.

distance was not too far less than 500ft.  

could anyone tell me the reason? altitude was too high?

battery can be fallen off from drone while flight ?

i attached some pictures of log analysis and link to LOG file.

start of flight

https://drive.google.com/open?id=1wFi-Qr6scscCr2mtOlMAUhFGO-s6NSLb

middle of flight

https://drive.google.com/open?id=1-HVbhaLrxdJFbEchN0Nn6p6yPDb06MLk

last of flight

https://drive.google.com/open?id=1Tm0WhSSGkljZkiPb7Y_dDTl2V2b7wD5o

logfile

https://drive.google.com/open?id=1fVvGZP2Ss8Jv3xP44IMwywAPe61jmSj1

for checking the log file

http://www.phantomhelp.com/LogViewer/Upload/

It was cruising at a good pace, You should open a case with support.  They may take responsibility for it and warranty replace your Spark.

Sorry for your lost. Please contact our support and start a case: http://www.dji.com/support You can provide us the flight records to locate the problem.

The Bash's Posted at 2018-4-23 20:19
It was cruising at a good pace, You should open a case with support.  They may take responsibility for it and warranty replace your Spark.

thanks. i will contact to them.

DJI Elektra Posted at 2018-4-24 00:21
Sorry for your lost. Please contact our support and start a case: http://www.dji.com/support You can provide us the flight records to locate the problem.

thank you for the link

Did you do a RTH from your RC ?

S.J Posted at 2018-4-24 11:11
Did you do a RTH from your RC ?

Before lost connection, i don't remember if it was returning manually or automatically. However it was coming to me for sure. I could see my car in the cellphone and map says it was heading toward me.
After losing control, i hit RTH button on controller several times.

I still don't know what was the problem.
I opened up a case, so i am waiting for their answer.

I've read threads regarding lost drones, from user-errors, to drone "kidnaps". May I ask if you are flying having a sight of nearby birds? Like hawks or eagles that are big enough to battle the drone?

Lstumpf3 Posted at 2018-4-29 19:52
I've read threads regarding lost drones, from user-errors, to drone "kidnaps". May I ask if you are flying having a sight of nearby birds? Like hawks or eagles that are big enough to battle the drone?

no way. there could be a bird around the drone, but i don't think it happened by bird because the connection was totally disconnected suddenly. Even though a bird snatched the drone,  flight data should be sent to my phone until a bird broke the drone, so i don't think it happened by a bird.
i didn't get any signal from drone suddenly. that is mystery.

I'm sorry to hear that, hopefully you can speak to DJI about what options exist for your Spark. Good luck.

davidmartingraf Posted at 2018-4-29 20:45
I'm sorry to hear that, hopefully you can speak to DJI about what options exist for your Spark. Good luck.

Thank you. I am talking with them, so I hope they can give me clear answer.

Never good hearing about a lost Drone,, I can't think of any fault that would have contributed to this. As you could see the Drone returning did you notice anything unusual??  Hopefully DJi can assist and give some positive spin on this..

chamdew Posted at 2018-4-24 04:48
thank you for the link

Please contact us if you need help in your case.

Flighty Posted at 2018-4-29 21:08
Never good hearing about a lost Drone,, I can't think of any fault that would have contributed to this. As you could see the Drone returning did you notice anything unusual??  Hopefully DJi can assist and give some positive spin on this..

nothing was unusual. thank you for response.  

chamdew Posted at 2018-4-29 19:58
no way. there could be a bird around the drone, but i don't think it happened by bird because the connection was totally disconnected suddenly. Even though a bird snatched the drone,  flight data should be sent to my phone until a bird broke the drone, so i don't think it happened by a bird.
i didn't get any signal from drone suddenly. that is mystery.

That is really a tricky case to solve. Have you tried looking for your drone where it recorded its last position?

Lstumpf3 Posted at 2018-4-30 23:45
That is really a tricky case to solve. Have you tried looking for your drone where it recorded its last position?

No i could not. I gotta come back home. the place is not closed to my home.
thank you for reply.

flight log
http://www.phantomhelp.com/LogViewer/TR4TQKCFO3YJOAX6AZLY/

InTheReeds Posted at 2018-5-1 09:05
flight log
http://www.phantomhelp.com/LogViewer/TR4TQKCFO3YJOAX6AZLY/

thank you very much for the link.

The altitude was too high i guess. Its more of a pilot error rather than a technical...

Ryan Olivas Posted at 2018-5-1 20:57
The altitude was too high i guess. Its more of a pilot error rather than a technical...

the limit of altitude is set by manufacture, i cannot fly higher than limit even though i want to fly higher.
i had been to that altitude many times, but there was no problem.
i think nobody pay attention to limit of max altitude and try not to reach the max height.

chamdew Posted at 2018-5-1 21:14
the limit of altitude is set by manufacture, i cannot fly higher than limit even though i want to fly higher.
i had been to that altitude many times, but there was no problem.
i think nobody pay attention to limit of max altitude and try not to reach the max height.

I believe it's less of a pilot error, but we'll see what does the logs have recorded in it

Lstumpf3 Posted at 2018-5-2 23:50
I believe it's less of a pilot error, but we'll see what does the logs have recorded in it

They said they were analyzing again, so we will see what they find soon.

chamdew Posted at 2018-5-1 21:14
the limit of altitude is set by manufacture, i cannot fly higher than limit even though i want to fly higher.
i had been to that altitude many times, but there was no problem.
i think nobody pay attention to limit of max altitude and try not to reach the max height.

The maximum allowable altitude is 400 feet above the ground, and higher if your drone remains within 400 feet of a structure.

Have the logs uploaded

chamdew Posted at 2018-5-3 19:47
They said they were analyzing again, so we will see what they find soon.

Whoa, I hope nothing serious have caused that kind of catastrophe. Wonder why it took them long

Ryan Olivas Posted at 2018-5-3 21:13
The maximum allowable altitude is 400 feet above the ground, and higher if your drone remains within 400 feet of a structure.

is that in general? or just a specific drone?

natnatroswell Posted at 2018-5-6 21:08
is that in general? or just a specific drone?

basically its in general. kindly read the manual...

Ryan Olivas Posted at 2018-5-8 20:56
basically its in general. kindly read the manual...

Okay dude! thanks for the info.

my case is solved . it is ended up with 50% discounts.
we couldn't find the reason for disconnection and gone. it is still mystery.
however, i am satisfied with 50% off. thank DJI for trying to understand my case. it took a little bit , but DJI never stop talking with me and trying to solve the problem.
if somebody has the same problem as mine , just talk with DJI support. it is worthy to talk with them.

thank everyone who has pay attention on my case

chamdew Posted at 2018-5-10 09:59
my case is solved . it is ended up with 50% discounts.
we couldn't find the reason for disconnection and gone. it is still mystery.
however, i am satisfied with 50% off. thank DJI for trying to understand my case. it took a little bit , but DJI never stop talking with me and trying to solve the problem.

Good to hear that. DJI is a trustworthy company indeed

While your waiting for a Case Reply, here's a though for consideration.  The file you shared (last of flight) shows Sport mode at a speed of 31+mph.  At that altitude it's possible that wind gusts may have contributed in some way.   If the aircraft was flying into the wind and a gust hit it head on or sideways the angle of flight may have been enough to kill the motors.  I have NO first hand knowledge of having this happen.  I read a few posts on other forums where this was shown as a distinct possibility.  If you watch a few videos that talk about "hand catching" the Spark they show a feature that lets you stop the motors by grasping and tipping the aircraft past 90 degrees.   I've never found information that indicated the feature was "disabled" when in full flight.  Something to think about.  Good luck with your Case.  Let us know of the outcome.

WebParrot Posted at 2018-5-11 05:19
While your waiting for a Case Reply, here's a though for consideration.  The file you shared (last of flight) shows Sport mode at a speed of 31+mph.  At that altitude it's possible that wind gusts may have contributed in some way.   If the aircraft was flying into the wind and a gust hit it head on or sideways the angle of flight may have been enough to kill the motors.  I have NO first hand knowledge of having this happen.  I read a few posts on other forums where this was shown as a distinct possibility.  If you watch a few videos that talk about "hand catching" the Spark they show a feature that lets you stop the motors by grasping and tipping the aircraft past 90 degrees.   I've never found information that indicated the feature was "disabled" when in full flight.  Something to think about.  Good luck with your Case.  Let us know of the outcome.

thank you for your reply, but the case already has been closed

thank you for showing another possibility. yes strong wind could be the reason, but i think the connection can not be disconnected even though motor is dead. if motor was dead, the drone would be fallen. the flight log should say altitude was getting lower until the drone reached to the ground because flight log is updated every about 1/10 seconds .

chamdew Posted at 2018-5-11 09:24
thank you for your reply, but the case already has been closed

thank you for showing another possibility. yes strong wind could be the reason, but i think the connection can not be disconnected even though motor is dead. if motor was dead, the drone would be fallen. the flight log should say altitude was getting lower until the drone reached to the ground because flight log is updated every about 1/10 seconds .

if drone is flipped , flight is ended ? and flight log is not updated?
i never thought about this. this is possible hypothesis too.

Ryan Olivas Posted at 2018-5-10 22:11
Good to hear that. DJI is a trustworthy company indeed

I agree