frame spikes during games

I play CSS, Americas Army, and Call of duty 4 on my laptop. I usually run cod4 and css at 125 frames while I play and America's Army is capped at 85. Every 5 minutes or so of gameplay my framrate drops to about 20-30 for about 10-20 seconds. This causes some significant problems during match play.I have attached my dxdiag to this post.

I shut down my laptop every night, I have it in an air conditioned room and it sits on a laptop cooler. I unplugged my external harddrive and updated all of my drivers 2 days ago. I have also turned all of the graphics to low and I cannot stop these frame drops.