It's a rather weird one since I've never experienced it before. Basically, my fps tends to drop to 0 FPS for straight 2 minutes for no reason. And it's only WoW, since every other program running still works fine. And my computer isn't even warm. Now, this tends to happen during arena, and it hasn't happened anywhere else.

I just can't seem to understand why, and as soon as I died, my FPS is back at 30-40. Can anyone help me ?

NVIDIA GeForce 9600M-GS 512 MB
DDR3 4GB RAM
Intel Core duo 2.1 GHz

I usually play on everything ultra and shadows turned off with a good 20-40 FPS in capitals.