Not sure if this has been asked in this thread yet (only gone through about 1/3 of the 212 pages so far). My JP Premium has two stuck ball issues.

One is at where the spinner lane meets the upper loop. There is a swinging gate that keeps the ball from dropping down through the spinner lane. The ball gets stuck either above the gate (the lost ball mode can free it here) or, worse, the gate swings back ~ 1/4 of the way and the ball sticks there. If the later happens I have to either pull the glass and remove it or knock it out on the next ball. Is this a known issue with a known fix?

The other happens sometimes with a rejected tower shot. If I am really unlucky the ball with either go under or on top of the plastic behind the raptor. In this case the only way to address it is to pull the glass and remove the ball. Known issue? Known fix?

Other that those the game has been pretty solid. I was getting some ball rejects (~5%) on shooting but a shooting lane protector seems to have cleared that up. Also has some issue with the right ramp to tower transition mentioned in this thread. Adjusted the ramp exit and it seems to transition cleaner.

Thank you for the pointers! I adjusted the one-way gate and seems to not push back in like it was before. Now it can only get stuck above it which is freed by the lost ball sequence. Will try out one of the suggestions for behind the raptor pen and see how that goes.