Had this exact issue about 10 months ago - advice was circular file it and replace with a supported unit (but again commercial not rec so the gear is somewhat more 'consumable'). Unsure if there is a permanent workaround for this issue but it would be interesting to find out as its a pain when the units decide to stop playing with what feels like built-in obsolecence in otherwise ok gear. Had a tech on another boat for another unit at the same time, which was an antenna cable issue - was thinking it was unusual to kill off two at the same time and the word Russia was uttered... Ended up with a pair of new units which I would consider as rec grade, we will see how long they last. Only one I have never managed to kill in the warranty period was a Raymarine setup - might have gotten lucky with that one. Best effort was four of a brand I won't name - same button on all four stopped playing.
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