I found very similar in my 2014 Rockwood A122. The stereo had a mind of it's own, coming on at times when it was "off" and shifting modes.
Finally traced it down to using an automotive stereo which has 2 separate 12V+ leads - one controlled by the ignition key through the ignition relay, and one going directly to battery to run backup stuff (memory, presets, etc) while the ignition is off.
In an RV both leads go direct to battery, and there is no ignition relay to turn most sections of the stereo off. If you disconnect the battery, and then reconnect, the stereo starts over from scratch, just like disconnecting the battery in a car causes the stereo to lose all it's memory and get dumb again.
Because of this intermixing of normally separate functions, a car stereo in an RV can suddenly switch modes or other unstable behavior when the camper is first plugged in or the battery is reconnected. This is especially true for the cheapest car stereos, which is what Forest River uses in A-frames.
I put a separate disconnect switch for both 12V+ leads to keep the stereo from coming on in a random mode whenever I reconnected the battery. I did lose my presets on the FM radio and equalizer settings went to default, but the stereo now functions normally on those rare occasions when I use it.
Fred W
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now 2019 Flagstaff T21TBHW A-frame
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