Edit: Finally found a thread with a similar situation. They found that there was no more freezing after the Catalyst Control Center was uninstalled. Is this safe to do?
Here's what's going on:
The day after Black Ops 2 came out, my system started having hard crashing issues. There was no trigger that I could find... Sometimes it would crash after 2 minutes of playing online, sometimes I could go well over an hour. There's nothing specifically that I can find that causes it. I haven't noticed it in any other games either... I've played full games of League of Legends without having any issues. I'm pretty sure I played some Assassin's Creed 3 and Hitman: Absolution without issue. I faintly recall having it happen in Hitman: Absolution once, but that's a slight possibility. I just tried updating my graphics drivers, to no avail.
Essentially, what happens is a total system lockdown. Video freezes, keyboard+mouse stop working, and all audio (from all applications, not just CoD) immediately stop (no audio stuttering). I have to hold the power button to do a hard reboot just to get my system working again. This is getting extremely frustrating, as every time it happens (frequently) I lose both my experience from that match as well as get marked a loss. I opened a support ticket to no avail so far. I figured I would try here before trying the Call of Duty forums as it seems like getting help there is a bit farfetched. I should also mention that this isn't a heat issue: the case doesn't even feel remotely hot.
Oh, and here's system info:
Time of this report: 12/2/2012, 06:04:29
Machine name: FUCKYEAH
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.120830-0334)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 03/27/12 15:35:58 Ver: 10.10
Processor: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz (12 CPUs), ~3.2GHz
Memory: 16384MB RAM
Available OS Memory: 16362MB RAM
Page File: 2945MB used, 29775MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 32bit Unicode
It is happening to me too. The game was flawless for the first month but since March 29th it freezes on me nearly 100% of the time. However the crashes are at totally random points. Sometimes early game, other times mid, and sometimes at the very end.
Occasionally I will get a blue screen like this:
I have an HD6870, however I know of other people with GTX660s who have the same problem.