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?