Flaky network connection

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http://forums.androidcentral.com – Hi everyone I am the proud owner of a new HTC One and absolutely love it. One issue though, after a couple days of fairly heavy use. Everything works brilliantly on wifi but is a bit flaky on a mobile data connection. For example, the Gmail app works but the HTC stock mail app stopped working (same Gmail account). My VPN connection won't connect on mobile. Any ideas on what might be the problem please? I am not very tech savvy I'm afraid.. Any ideas would be much appreciated... (HowTos)