Another data point for you, the only time I have had a button run-away (it was on 10a) was when navigating the playlist menu. The unit was not playing (it had got to the end of the playlist), there was no frantic clicking going on, I just clicked "up" onces and it ran away, cancelling several menu levels before powering off. Everything was working fine when I pressed a button to power it back on.

As I said, I have only had this happen once.

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Unit serial number 47 (was 330 in the queue)...