The ball got stuck between the two sides of white bricks on level 2 for me, bouncing back and forth in a pattern but never going back down.
That being said, this game is still amazing.
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No problem.
I did an unfinished prototype once of a game with ball physics. It made me realize that ball physics can't always be perfect without ruining the physics. So I added a "Restart level" button to the prototype, which seemed to fix it.
That might be a simpler solution if a more direct patch isn't possible. Though, it can still have its downsides, such as people utilizing it at the last second when a ball is about ready to go out screen, to fun the game.