The game resets at random, after twenty minutes or two hours, in play or in attract mode. Flipper use makes no difference, and 5 V reads fine after rebuilding the usual connectors.

Random resets after a full 5 V rework: bad J130 connector on the power driver

Cause: A poor connection at J130 on the power driver board, though it didn't look burned.

Checks

• With the game running, gently tug the wires at each power driver connector; a reset when one is touched points to it.

Fix

• Repin J130 with a new housing and Trifurcon pins.

Systems

• WPC Fliptronics

Games

• Doctor Who

Related tips

• Resets: +5 V at the driver board test point is low
• WPC-89 resets on low +5 V: replace the small 100 uF 5 V filter caps
• Reboots at start-up and when flipping: flaky power connector to the CPU
• Resets during the Powerball battle: reseat J101 and J115 on the power driver
• Resets when the game is cold: the power box thermistor
• Resets and GI that will not dim after BR2 was replaced
• After a power cut: resets, then won't serve a ball

Source: Pinball Repair help group!! (Facebook group)