Xbox 360 freezing alot?

It seems since the latest update my 360 seems to freeze it only does it on newer games. E.g. Ive had oblivion since i first got my xbox in 2006, it works perfectly fine. 2008 I got a elite after my first xbox red ringed twice... Anyway I recently got HUNTED and G.R.A.W 2 (GRAW being preowned) both freeze on hunted I had to restart the same checkpoint 5-7 times not from dying just restarting my console it became a race against time rather than being able to enjoy the game. Anyone else having freezing problems or do I invest in a slim? lol