#1 I'm 99% certain this only happens on a 3 ball game. Will adjust automatically if you change to 3 balls.

#2. All Sterns of the era do this, can't be shut off. (same when ball 2 ends on 3 ball game).

#3. Your back leg height level affects this. If you go high, like I did, this happens more frequently. There is a tiny bit of room to place a plastic cap on the top of each of the 3 upgates, but it's tight..too big and it will jam or not go down correctly.

Great game. Miss mine.
You have a great mix bag collection.