I've had the same problem a few times. Either when hitting the Z to zoom in on a target and line up or diving into a furball (or out the other side of one). Not every time, and I cant reproduce it with similar circumstances regularly. The last 3 times it has happened, I noticed that if I let it go, the sounds would go from normal (but still frozen screen), to a superfast loop, then will come out of it and the game function normally. I have noticed also (might be related) that since the new version I have been getting connection drops with no noticeable problems on a route trace. Sometimes I cant even log in (game cant find a connection), but relogging fixes it. This happened after each update (ver. 2.02 and patch 1), and 3 other random times.