Quoted from coz6:There is a chip right under the batteries I would reseat it as well caused odd behavior in my game (actually found battery acid under it) but others have fixed just by getting it tighter. My symptoms would be a few targets would reset the game similar to your Issue
This, and I've had a Monopoly reset on me because I didn't have good volts at the outlet. Stern needs 105v or above to run smooth, which can also be compromised while running an AC or fridge on the same circuit.