Fyi I've identified the problem :). I downloaded the .DAT file and found that the OA:radiusLimit and the OA:horizNearBoundary went to TRUE status when the mode changed back to GPS mode from ATTI. Although I was flying on a large open field, I must have set the maximum flight distance too low and...
Here is the flight log for the 1st flight when this happened. ATTI is set 16sec into the flight. The "self-reset" back to GPS mode occurs 12min13sec into the flight. This happened on subsequent flights, several times after I switched back to ATTI.
During my last 4 flights with my new P4P (only 2hrs flying time) the ATTI mode would switch back to GPS mode without any reason/warning. This didn't happen with the flights before these.
The ATTI mode was selected using the switch on the controller. However the mode would change to GPS and...
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