Quoted from Fuse:
My tz would reset if both flippers were hit at once during about the first 30 seconds of the machine being turned on. No big deal as I could just not hit both or wait 30 seconds. Decided to go with this board and no issues anymore. I'm no expert but I'm guessing I have a thermal intermittent chip.
It's probably your Thermistor--if so you can buy one here:
Test yours by doing a bypass explained here: