So I was piloting a flying wing, take off and climb to about 300 m with FBWA mode. 
Then I switch the flight mode to Auto.

But the problem is, what was happened : the Flight mode in the GCS won't change to Auto, Throttle cut to zero, and the aircraft start to glide,

Then I tried  to switched it back to FBWA and manual,it worked, and the GCS also shown the right flight mode. 
But after I changed it to Auto it didn't worked (again). 

The plane end up stalled and crashed. Then I change it to auto, It worked. :(


Guys I need your help about this problem. I'm really at lost. I tried to test the auto switch on the ground. It sometimes worked (the Mission Planner shows Auto Mode), but sometimes it delayed, sometimes it didn't work at all.

I already check the tlog. from the APM, at the time the plane switched to auto, there is no signal change from the switch ( Channel 5).

What could be the problem here?
Help me please ;(

Thank you and sorry for my bad english. :)

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