ios 5 heating during usage

Since using ios 4.3.3 up until ios 5 beta 2, ive been experiencing serious heating issues during usage on my iphone 4. For some reason the cpu is being used excessively when i start browsing the internet, facebook, twitter, anything really when the phone isn't sleeping. I've tried the obvious fixes (turning off ping, hard resets, restore as new phone, even turning off all mail and icloud accounts!) and am wondering if anyone has figured out any solution to this problem or if my phone should be replaced? Obviously with extreme usage comes extremely terrible battery life, talking 1% per 2 minutes of usage. Any input would be great.