Sorry you are having the problems you have. Not sure what the issues may be, but I know that my EX7 rocked in the games. It didn't have the newer equipment in it (3.6ghz with 6800 Ultra), but everything I was playing on it, was being played at max settings - to include DOOM3, HL2, Far Cry, Guildwars, etc. I hadn't played COD, not even sure if it was out then, and I am not sure if I had a game similar to it.
And the EX7 seems to be a lot more stable than the FX7.
Also - not saying this is related, but interesting to read: http://www.notebookforums.com/thread166251.html
. I may be reaching, but just checking to see if others may have had issues related to yours with this model.
I hope you can find your resolution to your problem. The system needs to perform to the level you expect for you to be happy - and maybe someone has some information out there that may help. I know there has been some patches/tweaks for some games to work better with notebooks. Maybe there is something for you.