Ketsui PCB Crash

[Link_Z]

Hello! I booted up my Ketsui PCB and got the crash you see in this pic. After resetting the game, I started a new game before the demonstration screen shows up and everything played correctly. Do you guys know what happened there?

[EOJ]

Weird! Is it an original PCB or one of those PGM conversions? If original, has the battery been replaced?

[Link_Z]

Yes! It's an original PCB, and the Varta battery has been replaced, yeah.
I've had a few sessions after I posted the initial message and the error never happened again. 

[SuperPang]

Have you checked the 5V under load?

[Link_Z]

Yes

[peg]

This is normal.  You are playing on the first version pcb that has this bug. Upgraded your eprom to the newer version to fix it.  Otherwise just make sure to start the game before the demo begins and it won't happen again until its powered down.

[Link_Z]

Thank you peg! I think I'll leave it as is.