Samsung G600. I got this phone on contract in December 2007. It worked fine initially but within a

Question

I got this phone on contract in December 2007. It worked fine initially but within a few days, the phone started freezing while I was texting or calling or even while using the camera. It sometimes switches itself off & then on again and then takes a long time to restart & sometimes shows the battery to be empty even when charged fully. Not sure if this is a problem with my handset only or is it a design issue.