Has anyone else ever seen this error on a M300?  Ive been getting this all the time since new and sent it back to D1 store who had it for 2 months and said they couldn't find a fault so sent it back and still happening and now asking me to send it back again.   

Hello, there. Sorry for the inconvenience. May we know the Serial Number of your aircraft and your email address? About your issue, we will consult with our engineers first.

Would you please follow the video to install the Frame Arm Sleeves and see whether the issue can be resolved?
https://pan-sec.djicorp.com/s/7nyRZdWKCNzMCxR

Do you unfold the propellers and align them more or less correctly before starting to reduce vibrations?  When does the message appear?  I've had this message before but can't remember when and why.

LV_Forestry Posted at 7-10 00:49
Do you unfold the propellers and align them more or less correctly before starting to reduce vibrations?  When does the message appear?  I've had this message before but can't remember when and why.

yes i do that always and it doesn't always do it straight away often its a few minutes or more into a flight and thanks Wands yes i always do them up tight like this..  Dji says there are no sensors in the arms so not sure what is causing this.  

AIRWORKS. Posted at 7-10 01:07
yes i do that always and it doesn't always do it straight away often its a few minutes or more into a flight and thanks Wands yes i always do them up tight like this..  Dji says there are no sensors in the arms so not sure what is causing this.

I found the logbook where I noted the error message. It was a very windy day.

You may have a balance fault on a propeller. I suggest to try replacing them with the spare propeller kit and see if the error persists.

In general, try to find what can cause vibrations. I'm not sure but I have the impression that it is a particular vibrational frequency that causes the message. Maybe the IMU detects it.

I had the same message when using top mounted payload during an automatic flight where the UAV was doing some funky short lines. Are you using a "standard" payload? If not, try to calibrate the center of gravity.

AIRWORKS. Posted at 7-10 01:07
yes i do that always and it doesn't always do it straight away often its a few minutes or more into a flight and thanks Wands yes i always do them up tight like this..  Dji says there are no sensors in the arms so not sure what is causing this.

Thanks for your reply. Please confirm the aircraft take off at level ground. Check whether the RTK Antenna is loosened.
If the error message persists, you are advised to send it back and check the antenna.