Dreamcast - Audio/Video issue (not random restart problem?)

[Ghudda]

Overheating and/or bad solder joints that expand and become open circuits.

Thanks for the reply, APE
I notice that the Dreamcast is a bit warm on the bottom after it's used and after the issue occurs. The fan is working fine. What should I be looking for as far as bad solder joints? Any suggestions for keeping the Dreamcast cool? I've kept the Dreamcast off the ground on a flat surface so the air circulation should be decent.

Ghudda