Support Data Connectivity Issue (ATT)

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http://androidforums.com – Ok so i've had my S3 for a few weeks now and I am having issues with the internet. One minute it works fine, the next minute it won't and I have to restart the phone and then it works fine again... until the next time. So I contacted ATT and they got me a new SIM, changed it, and still the same issue. Is this something thats common and there is a fix or update for it? Or do I just need a new phone? (General)