So I bought an S3 off Ebay a couple weeks ago - it was listed as used but working perfectly and in good condition. Over the last few days, its started rebooting itself. It looks like a battery connection issue because the screen flickers for a couple seconds then it switches off and the battery is drained, even if it was fully charged before. The only reason I'm not 100% that its a battery issue is that it only happens when I'm using snapchat. Help/comments would be appreciated. Ta guys