My AVIC-F920BT after a successful update (2015 maps, version:6) has a special issue of radio receiver.
Sometimes (without pressing any button, or the touch panel) the radio receiver CHANGES from FM to AM.

Manually I can change back to FM and the FM station remains the same as it was before.
I disconnected the steering wheel remote controls, but the failure remained.
What could be the reason?
-Touch panel ?
-RDS-TMC tuner (CXE2176) ?
-Software ?

Thank you for any advice !

SOLVED !!

 

Pioneer AVIC-F920BT was connected through a CA-R-PI.113 adapter. It's been changed to a CTSKI002.2 and a CTPIONEERLEAD adapters. Now, everything works fine incuding the steering wheel remote controls (the phone controls too )