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Mine does that to, but I just suffer through the excercise of toggling it back to FM. Just didn't want to go through the long distance effort of getting another radio ordered, seeing as it took two months the last time I had it replaced.
I use the CD player almost exclusively. When I crank the bike the radio screen goes blank. Most of the time it comes back up on the CD player. Sometimes it comes back up on FM. I just push the button to get back to the CD player. This is my 2nd radio and the other one did the same thing.
I don't know of a cure for this. Just push the button.