I'm in windows XP, and I have a problem where the game will randomly freeze up during a fight (only during fights, and I only play as aliens). The ingame console will show nothing, and when I type /disconnect, the server I was on (whatever it may have been, tested several) will disappear. All other servers will show up. After one min to 5 min, the server that disappeared will reappear, and I can connect and play normally until it freezes again. The freezes always occur when lots of firing is going on, and lagometer shows nothing (it freezes too).
Edit: When the freezes happen, I can open the console and see the line 36 arenas parsed . Sometimes this line will print several times in quick succession.