Quoted from Av8:This is the first time I've had a trough issue with a Stern. Tron Pro will occasionally kick out 2 balls. And sometimes end before the ball is in the trough. Very annoying. The problem is intermittent but getting worse.
The ball trough has 3 roll over switches and a opto board. Anyone else have this problem?
I'm going to go with no on "anyone else have this problem". It's going to be a switch issue. I'd start with the left most roll-over switch. If it is getting intermittently triggered when no ball is there, I think all these issues could appear.