Toshiba Satellite L750 having FPS drops

My Toshiba Satellite Specs
CPU: Intel i5 2410 2.30GHZ
Graphics card: Nvidia GeForce GT 525M (Driver Version: 331.82)
RAM: 8 GB (More RAM added to try and fix this problem)
Windows 7 Premium 64Bit

Problem: After about a year of using my Toshiba laptop, I have been experiencing massive FPS drops. I will be playing a game at 30-60 FPS then it will spike down to 3 FPS every 20-60 seconds. I just want to know how to fix this or if others have this problem because it is driving me up the walls.

PS. My hard drive is barely used and I have tried a disk clean up and defrag!
Regards!