The game resets during play when a particular coil fires (here the drop target in front of the captive ball), even after a reset-fix daughterboard was added for flipper resets.

Resets when a drop target or coil fires: burnt power and GI connectors

Cause: Poor contact at burnt connectors on the power driver board. A daughterboard only masks the 5 V dips; the underlying connection problem remains.

Checks

• Inspect the GI connectors (J120, J121) and the main 5 V input connector (J101) for browned housings and dull or burnt pins.
• Check the bridge rectifier and filter capacitor for the 5 V supply (BR2, C5) and the capacitor C4 for bulging or poor joints.

Fix

• Replace burnt connectors with new headers and housings using high-current crimp pins.
• Repair the 5 V supply section rather than relying on a daughterboard.

Systems

• WPC DCS

Games

• Indiana Jones: The Pinball Adventure

Related tips

• Flippers, mini playfield and optos dead with endless ball search: blown 12 V fuse
• Resets: +5 V at the driver board test point is low
• Resets remain after rectifiers, caps and connectors are done
• Resets or dead banks of coils or lamps from cracked bridge or cap solder
• Pre-WPC-95 resets: replace BR2, C5, C4 and the J101 pins together
• Indiana Jones: flippers die, one display line lit, balls keep launching
• What a WPC game reset is
• Watching the supplies while the game resets

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