S3 freezes and battery drained. Help!

My S3 is constantly freezing while my apps are running. For example, if I am using the camera, it would just freeze. When Im on Facebook or playing games it would freeze anywhere between 5-20 minutes of usage. When I take my battery out and turn the phone back on the battery is completely drained.
Do I need a new battery? I have tried deleting apps, restarting etc but nothing seems to be working.
Any suggestions?

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