I have a Bally Lost World that reboots at anytime during a game, not in attract mode. I have re-pinned connectors going to CPU (new Alltek board) and driver board. The 5V was around 4.9V so I installed a new regulator and the voltage read 5.01 after that. At first I thought it may have been a pop bumper coil causing it because it seemed that when the pinball was around the pop bumpers the game rebooted. Sometimes you can play two games or 40, it doesn't matter. I have not been able to cause the reboot to happen by moving wires, connectors or activating coils over and over again. I'm stumped at this point. I would greatly appreciate any help. Thanks.

I also resoldered all the male connectors on driver board.

I measured the 5.01V on the CPU board. I went through every coil and diode and switch on the playfield to see if I could trigger a reboot and could not.

I discovered that whenever the ball was kicked out of one of the left or right saucers, the game suddenly rebooted, not every time but most times. Replacing the saucer coils seemed to have eliminated the issue. It has never done it since.