I've been making it a mission to correct the playfield anytime a ball gets stuck instead of just removing it.
If anyone else gets a ball stuck on top of the pop bumper cap for the robot, simply loosen the plastic over the cap and place it on top of the clear plastic protector that is supposed to stop balls from getting stuck. This lets the ball roll better because everything is angled. I can get a pic if this doesn't make sense.
My next one is this picture. I'm hoping a simple round plastic protector from CPR on the screw will be enough. Otherwise I'll have to make a clear plastic to extend over the post. This one was stuck good.