Location of the reciever antenna can have a lot to do with glitches, case in point, my PAU Edge 540. If I run the antenna through the nice tube in the fuselage, the thing goes nuts. Poke a hole in the covering in the bottom of the fuselage, tape it to the bottom, no more glitch. Have done this twice on the same airplane and I got the same results both times.

I hated to poke a hole in the covering, but what the hay, it worked!!!LOL!!

Dale