Quoted from jrcmlc:I've reset everything twice, cleared tourney data, cleared bookkeeping data, set it back up from scratch, so unless you really do have to disconnect the battery, the normal fix for this didn't fix mine. I only have the correct amount of balls in the chutes also, which I read can be a thing.
I had a weird occasional click like the game was trying to reload a ball from behind the pins sometimes. I cleaned all the optos (one is really hard to get to in the back) and that cured most of this issue. Still get it occasionally.
Also, idk if I’m unlucky but every Gottlieb I’ve ever had has had a cracked solder joint somewhere that I needed to reflow. I don’t think that is your issue, but worth checking. I’d start with opto cleaning though.