General S2 Loses Data Connection and Never Recovers

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http://androidforums.com – Help! My 2-year old GS2 has started dropping its data connection, and then never recovers unless I reboot it. Just tried a factory reset and that hasn't helped. No idea what to try next. Completely out of ideas. The symptoms are strange.... It works fine for a few minutes after bootup, and then drops from an 'H+' to an 'H' and then just sits there with the green arrow blinking intermittently (the orange arrow never blinks). No data is every transferred. Eventually, after a few minutes, the data connection disappears from the status bar altogether, never to return. I've trie (General)