LES Saab 340 Autopilot keeps disengaging

[Stevebarker120]

LES Saab 340 Autopilot keeps disengaging during flight.I use Alpha and Bravo controllers.

Seems to occur randomly. Sometimes when clicking alpha white button on controller, sometimes when just moving mouse,sometimes without clicking anything.

Can anyone point me to any possible causes or how i diagnose problem?

Are any plugins known culprits?

Thanks for your help