Game is a KISS pro. Flippers have normal action when game is cold. A couple of games in and the left flipper starts to stick (and gets progressively worse) and does not want to return.
Here is a short video of the difference in flipper action:
As you can see, the flippers were recently rebuilt, so nothing is “worn out”.
This is a head-scratcher to me. Trying to figure out what might be expanding as it heats up to cause friction but I can’t figure it out.