Alright so this is an odd one. Friend has a Stern Rush Le and it is having a very strange issue. Before you suggest a new SD card I have created multiple for him and the issues continue.
The game works fine for a few minutes but eventually it stops loading videos. The sounds work fine. Getting the mystery shot takes a while to spit the ball back out. The end of ball bonus also takes forever. Entering a high score is not possible. Hitting the flipper buttons seems either extremely delayed or you have to hit it at just the right time to register input.
So the game technically plays fine for the most part, other than bonus and mystery being sluggish. Any ideas? We have reseated the cables and installed (multiple) new SD cards.