We are aware of a memory leak in the game application that appears to lock-up the game after 3 or more successive games are played. We are working hard to identify the cause. In the meantime, we recommend refreshing your browser after every couple games to reduce the chance of a game lock-up occuring.
We would appreciate if you would report any game lock up occurences in this forum- along with your browser info/num games played/and any info or screenshots, as this will help expediate the process of correcting the issue.