My Black Knight will boot and play fine for several games. Then for (seemingly) no reason, it will blow the solenoid fuse during a game. I haven't noticed any patterns when the fuse blows. I've had the glass off and hit every target and tested every coil several time to try and recreate the problem When it blows, both slingshots and the pop bumper will lock on until the fuse blows. I've replaced the 40 pin connector and checked for cold solder joints on all of the boards. Thanks for any suggestions.