Training server Freezing

[firefly7]

I had this problem maybe 2 or 3 months ago: When I'm on the brigade screen, I click the "Back to personas" button and my computer does its normal sound ticking thing that it does for loading etc, to show that it's working. Then, before it actually switches pages, it just stops, and the screen stays there. I can't click anything, but i can move my mouse. I tried ctrl-alt-del to bring up the task manager and it does the working sound again, then just stops. I've tried AltF4ing also, but that does the same thing, usually for less time. Eventually I just have to hold down the power button to force shut-down my computer.

As i said, this happens while switching brigades, but also quitting missions, and making them occasionally. I used to (and still do) think that it was caused when me and some friends are having extremely close-knit infantry shootouts, with lots of respawning, and when i start getting excited and exiting the mission, brigade, and/or personas too fast, it just freezes. However, on saturday, I was exiting a mission, and because of the previous 2 freezes, I went carefully and slowly, and because i was ML, that "are you sure" box comes up, I slowly click ok, and it just freezes. This hasn't happened for a couple months, but then, in just one day (saturday i believe), it happened 3 times, which gets extremely irritating because it's worse than a ctd/cthl, cus you gotta force-shut down your computer, and that can't be good for it.

I really don't want this whole thing to start over again, because sometimes I'll be playing or practicing stuff with someone and this will happen, then I come back and they're not there because they think i've left. It just really stinks.

Anyone know anything that could clear this up?