Support Clock issue

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http://androidforums.com – Hey, I've just bought a Galaxy S3 and I'm having huge problem. The phone's clock doesn't work with the screen locked. If it is 15:00 when I lock the screen, 10 min later when I unlock it still shows 15:00! And I'm not saying the AccuWeather, the actual phone clock. I've tried rebooting it and re-installing the firmeware and it didn't solve the problem. This happens even if I set the hour by the network or manually. Since most of the apps just work with the correct time this is becoming a big headache. Any help?? (General)