I've had the same issue. If lock switch 3 is hoarked, it will affect the others. It'll think that there's either more balls locked and try to kick earlier, or go to ball search wondering where the other two are. I trouble shot them one by one for a while, but for the price of a switch, I said the hell with it and just replaced all three. Reflow the solder, replace at least #3, if not the other two, then go from there.

You have 2 or 3 lock switches. There should be 3.

There definitely is not a 4 ball mb in the game. I forgot why, but someone explained the purpose of the 3rd switch a while back in the lock lane. The game (at least for me) definitely gets pissy if all 4 don't work.