I've checked all switches to make sure they were working and not stuck. This game had several mods. Backglass led kit, lit flipper buttons, topper lighting, shaker motor, speaker lights. Game appears to have low plays.

* Ball over
I'm not sure what causes this exactly. But the flippers die and the ball is over while it is in play. The only thing I've noticed (possibly) is there's 1 ball locked in the coffin. At some random time and it's not repeatable, the ball ends. This recently started happening.

* Snake biting the ball
I'm not certain how to adjust the jaw. I called support and have the manual but can't figure out how to adjust the height of the jaw, if this is the solution to this issue. I've had a pro in the past and this was pretty easy on that. Premium is more complicated. I have it currently disabled. But the ball would go up the tongue, not going all the way in and slowly fall back down to the right in the mouth, the snake bites the ball. Without it disabled I tried testing the jaw with the coin door open, that got old. Then disabled.

* Not all balls register when hitting Sparky
With the glass off I can't replicate it. It must be fast balls not setting off the opto. I've reseated the connectors on the opto board and blew air at the sensors in case there was any dust. Did a switch test but all tests I did were successful. About 1/5 balls don't register.

Has anyone run into these issues?

I didn't think about this. Good point. Thanks.

I had a pro. It was a lot less complicated to adjust the jaw. The premium has a lot of things going on and I wasn't able to figure out how to adjust the jaw height.

Thanks LTG!

I finally got a larger adjustable wrench and replaced the magnet core. It doesnt feel like the new core lines up flat with the playfield, its a little off. Would you rather have the ball hit the metal core a bit more than have the back part of the wood hole be a tiny bump? Its currently set to the latter and appears to register all Sparky shots now.