I put new coils,EOS and sleeves in that machine when I rebuilt it.

I would of not put more than 100 games on it, check the return spring has enough tension.

Like Nino said, power off when it is stuck to m ake sure it is a physical issue and not an electrical issue.

I bought my parts from PBR for the Cactus Jacks.

Cheers Angelo
I probably put 20 games on it since angelo owned it, didnt have to do a thing as  the game was fully shopped and working like a dream something must be loose or binding.