M4P lost connection and felt out of the sky

[Baronner]

My MP4 suddenly lost connection with M4P and seemed to felt out of the sky.

Facts:
- 119, height and 110m distance of homepoint (= also controller position).
- Full connection strength.
- No obstacles between motion controller 2 and the M4P. (Home Point (H) is visable below the swimmig pools)
- All batteries at > 75%.
- 22 satellites
- Goggles 2 and controller looses suddenly connection at a speed of 8.6m/s
- M4P didn't return to home

NB: prior to take off I was asked for a battery firmware update, which I did. Rebooted drone afterwards.

See link below for the camera view before loss (recorded from the Goggles 2). I do not have black box logs, since DJI Fly App was not connected at time of the loss

Video: MP4 connection lost & felt out of the sky (video was recorded from goggles)
Airdata: Airdata Logs

What could be the cause of this loss?

 

[Yorkshire_Pud]

the log on PH DJI Flight Log Viewer - PhantomHelp.com

 

[Yorkshire_Pud]

Uum I am getting a virus warning from firefox for the downloaded csv.

 

[Baronner]

Here no virus warnings and a perfect readable CSV. But the content is abacadabra to me ;-)

 

[slup]

...What could be the cause of this loss?

The loss of connection was most probably not the root cause, instead a consequence of the incident.

All attitude telemetry + battery data doesn't indicate anything abnormal just there in the end of the log, you had just started to apply a full command for forward flight (stick mode 3)... & then 4sec later the log ends with your mini still airborne.

All this strongly indicate a power loss, either battery related or due to some electronical fault. This stopped the motors, ended all connections & stopped the log recording... & your drone fell like a rock.

 

[Baronner]

Thank for your analysis. That's what I was thinking, and now the telemetry is supporting that version. Sunday, I started a Fly Away Case on the DJI website. No response so far, but I'll hope they support this analysis and will sent me a free replacement. Thanks again for helping me!

 

[mreco99]

That’s the worst nightmare, did you retrieve it ? Did controller tell you where it was?
And let us know what happens

 

[Baronner]

Didn't retrieve it. I sent in a fly away case at DJI. No progress on that case since last sunday.

 

[Baronner]

Tiny update: still waiting for a response of DJI. The analysis-team is very busy as they say. I was offered a 30 EUR discount code for their store for waiting so long.

 

[Baronner]

Still waiting. ;-(

 

[Baronner]

The drone has been replaced by DJI:

"As a conclusion, according to the analysis, the root cause of the incident could not be verified, due to interrupted app record. We kindly advise you to please pay attention to the flight environment and to fly with caution

However, we truly appreciate your support for DJI and you are very important to us as a customer. So since your product is under the warranty period, if the aircraft cannot be recovered, I would like to offer you a replacement DJI Mini 4 Pro aircraft, propellers and battery (without the remote controller and battery charger) free of charge. "

It took a while because mail I couldn't receive email sent from the fly away team. Strange, because all DJI marketing mail did not have any issue.

 

[Conservative Nihilist]

The drone has been replaced by DJI:

"As a conclusion, according to the analysis, the root cause of the incident could not be verified, due to interrupted app record. We kindly advise you to please pay attention to the flight environment and to fly with caution

However, we truly appreciate your support for DJI and you are very important to us as a customer. So since your product is under the warranty period, if the aircraft cannot be recovered, I would like to offer you a replacement DJI Mini 4 Pro aircraft, propellers and battery (without the remote controller and battery charger) free of charge. "

It took a while because mail I couldn't receive email sent from the fly away team. Strange, because all DJI marketing mail did not have any issue.

All's well that ends well. Thumbs up to DJI