Quoted from Hayfarmer:
Odd that some of us have had no issues, i turned my spinner around at maybe 100 games in and have not had it off once since. Shooter lane return wire has not been a problem either. Just got lucky I guess,,,,,finally.
You know that EM ball capture problem I and others were having? It was because I flipped my spinner, so when the magnet grabbed the ball and spinner, it grabbed the bottom of the spinner, which blocked the opto and caused the machine to never eject the ball for multiball. The problem is when you flip the spinner back the way it was, you get the same problem of the ball hitting the bottom and bending the arms eventually.
Stern has a HUGE spinner upgrade that they'll eventually send me, but for this one, you have to completely remove the carriage and rebuild all the innards: spinner, bracket, etc. I'm guessing they finally figured it out.