I know in Australia we are on 230v system and most residential outlets are 10A and so on.
The game could be at peak - say in a multiball using up to 9A which would leave 1A available. If say the service outlet was consuming 2.5A and then the game hits it's peak a brief reset of the computer board may occur...
Also from what I have been told the service outlet is always on so not idea as when the machine is off the service outlet si still running / on.