EM glitches sometimes clear with a power cycle
If an EM game suddenly keeps its motor running, its reels turning or a solenoid firing, switch it off and back on; a sticking switch, gear or relay often frees itself. If the fault comes back, leave the game off until repaired so nothing burns.
Systems
Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)