Samsung Galaxy S3 constsntly rebooting when idle.

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http://androidforums.com – I've purchased this phone recently off Kijiji (brand new) and I've unlocked it to work with Fido. It has only been 3 days of using this phone and it consistently restarts and reboots itself once I stop using the phone for a few seconds or minutes. I really do like the phone but this problem is really getting annoying.. Can anyone hhelp me? (General)