The game resets and other fixes have not helped.

Resets caused by a failing dot matrix display

Cause: A failing dot matrix glass can draw extra power and pull the other supplies down.

Checks

• Unplug the power connector at the display glass (not the ribbon cable) and play the game blind.

Fix

• If the resets stop, replace the display and/or repair the high-voltage section of the DMD controller board.

Systems

• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Dot matrix display supply voltages
• Dot matrix display blank or faulty
• Dot matrix display power connector pinout and voltages
• One or two display columns stuck on
• What the WPC dot matrix controller does
• Dot matrix display faults
• Blank display, garbage or diagonal lines: reseat ribbon cables
• Rebuilding the dot matrix high voltage section

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)