My all-wing plane flys crazily during auto misson then return back and completes the mission

Its a long mission. The takeoff was normal, and during line 3 plane flew out the line and got crazy, almost crashed. Ive checked the log, did not find anything wrong. Someone help me to find the problem, please.

!

The autopilot is pixhawk and firmware is arduplane v3.8.3.

Here the log:

Hello,
there seems to be a problem with Servo 1 (the left one). Looks like it was unable to move the elevon for nearly two minutes.

@Hubertus_Paetow Thanks so much! Ive seen this, but cant confirm it! Because it flew back normally again.

@Hubertus_Paetow Also how to turn graph of roll (mean 3) to display on the level of RCOU.C1 (mean 1536)?

That´s easy. Just right-click the parameter you want to display with a second axis on the right.

The servo malfunction seems to be temporary, so perhaps it is a problem with the cable or the connection to the pixhawk. Try to move all electrical connections of the servo while you test it.

@Hubertus_Paetow OK! Thanks, I will test it soon.