Could it be a bad Capacitor?

Yeh but if a flipper coil diode was bad - I would think it would always be bad, that is strange but I'm no pro. If after it is "warmed up" if you turn it off and back on right away is the problem still there - or is it gone from the "warm up" This might help us eliminate a few possibilities.

Well I guess the easy thing is to rebuild that flipper properly - let us know how it works.

Mike so what do you think causes it when its not warm to reset, but when its been on for awhile to work fine. Is it a heat thing or something totally different.

That sounds more logical then anything so far, learn something new everyday - I knew about the varistors but never had to change a thermistor - that also would make sense why he had to change his BR's also - hrmmmm its all starting to make sense.

hopefully thats the issue