I had that happen to me once. My score for all three rounds was less than I normally get for just the first round. I was eliminated after that, and in the next game I played it was back to normal.
Never had that happen to me, but I was once writing my friend a message and then the fireworks game started. I had my mail open in the middle of the fireworks game and so of course I had to message my friend again and tell her what was happening. Needless to say I did horribly in that game because I was so busy messaging ForeverWDW.