I've got a weird problem with a D&D pinball machine, every 4 or 5 plays the game will launch all 3 balls into the trough at some point during the play. Then, usually one or two of them will get stuck in the bottom and the error message "check FU1 or Field Fuse" will display. Upon removing the balls from blocking and turning off and back on the machine, the error message will subside for 4 or 5 more plays. Is this a common issue? If I change the fuse will that solve the issue or is there generally some other underlying problem that causes this to happen that I need to look for as well?