my samsung s3 i9300 screen went black and it restarts

Probably I used super VPN for free internet after that my mobile screen always turned off and restart I had factory reset several times I even flashed new aosp 4.3jb and omega rom aosp and till the same but when I flashed cyanogenmod it is not rebooting but when I again flash aosp it's the same
Please help me!!!!!!!!

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