So i don't know what causes this. But I believe the speed at which the dice move is tied to your computers performance. I tried to fix it by making the dice way too fast so when they slow down they are still fast enough to move. It works on my computer but it sounds like it didn't work for everyone. I can't even begin to imagine how to fix this unfortunately so i suppose the game is stuck unplayable which is disappointing. I learned quite a bit at the very least. (I made this on a MacBook so maybe that has something to do with it. it struggles to run most games even my own).