Hello, I’ve issues with my Pixhawk compass and I would like to have your expert opinion 
. (sorry in advance for by bad English).
GS report bad compass health and sometimes the flightmode change in Land (very dangerous for me because I flight in a forest).
Looking on the tlog (as explained in the compass interference site), there are mag_field custom_t value up to 2500 which is sounds as abnormal.
Ma copter is DJI F550 with e300 motor. External compass Ublox 8M mounted 20cm away from the frame.
Vibration level is more than acceptable.
There is someone that can help me to troubleshoot this issue?
Thanks in advance
Note: tlog in attach