Why my plane fly very high suddenly

Hi,

My plane fly very high suddenly. I didn’t change the throttle.because of vibration?
can you help me analysis it?
Here is tht log:http://logs.uaventure.com/view/yV8HMS2AyYbJQbaUgQRTq7

thanks!

You switched into manual throttle mode and hence it stopped holding altitude. In manual the pilot is responsible for throttle control.

Before into PosCtrl mode, the altitude is under 2m.in position control mode,the altitude is about 2m.but switch into Stabilised mode from posCtrl mode,plane fly under 2m a while,and then fly very high,the altitude is about 35m.It is differ greatly.

Before into PosCtrl mode, the altitude is under 2m.in position control mode,the altitude is about 2m.but switch into Stabilised mode from posCtrl mode,plane fly under 2m a while,and then fly very high,the altitude is about 35m.It is differ greatly.It seems lost control.