My super mario bros has been working perfectly for months now, then just this week, it isn't starting up properly. When I turn it on I hear the normal start up sound, and the GI comes on, but game won't start up... nothing on the display, won't recognize credits or operator adjust, its "frozen" with just GI. I've been just flipping the switch off, then back on, usually by the 4th or 5th time it starts completely normal and plays as if there's never been a problem... until I switch it off, then I've got a 50/50 chance it will start normal or give me just the GI. Worst case cenario I can always pull the backglass and hit reset switch and it works, but that gets old, so if anyone has any ideas what it might be or things to check, I'd greatly appreciate the advice, thank you.