A mechanics view would be check the board is tight on its mounts as it might be wobblying and shorting something.

Sounds hardware but try instead of using button to skip enter a menu using a remote or something and then pressing it.

The buttons i don't belive are smt and are available from non empeg sources
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland