Is it just the keys cutting out, or the Turntable as well?
If it's the turntable too, it's probably something like a loose power line, or could even be a problem with your controller port/connector. There's not really much that can go wrong with the keypanel PCB, unless it's physically broken. Check the wires that run from the main PCB (inside that main enclosure), to the keypanel connector.
It doesn't sound like anything major is broken, but just a loose connection somewhere.
__________________  |