Quoted from murdock:Yes, I tested it in the test menu and it works fine. I did notice last night that one of my Joker Targets was installed slightly below the playfield so that it was stuck closed. I am wondering if that switch being stuck closed plays any part in the machine losing track of the locked balls thinking that one is still in play or not. Once, I figure that target out, I will see if the lock problem continues.
Those stuck targets are a known issue with this game. There are many posts and solutions to correct the issue. It does need to be addressed though. Good luck!