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Been a bit, but I'm trying to figure this out. This is a problem that just started.

I have an all-original Qbert - fully working with all original boards and power supply. Filter board was upgraded to the Arcade Shop. Power supply rebuilt two years ago.

Switched to JROK board for more variety. Original PCB still in place.

JROK board starting to reset when knocker went off. Checked knocker diode and knocker, OK. Replaced it with a new one just in case. That's OK too.

Now, when the board changes to another board (you finish a board) it resets. Sometimes resets when knocker goes off but not all the time.

I'm baffled because I have had this board for two years in this setup and it's been fine. Now it's unplayable - and I'm bummed. Any ideas?
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