I have been experiencing this problem since I started playing at the beginning of June this year. Any map, any time. There have been instances of it happening more often on certain boards, sometimes back to back to back. If it does happen in a match that has at least 15 minutes left then it will happen an average of 2-4 times. As originally posted, exiting fullscreen and a refresh does the trick but that's roughly 30-45 seconds of downtime. One thing I have noticed is that (except for 1 time), it always happens just as I press W, eager to spawn in and move. Flash is up to date and my computer is quite powerfull. I play on Firefox. It seems obvious that with so many varied responses across several locations and on multiple browsers, that this is a programming problem, (likely?) caused by the semi-recent implementation of mouse use. Please fix this as it can be quite debilitating and sometimes acutely frustrating