Hello, I have HTC DESIRE 200 and I have a network problem .. it's weird but the problem usually occurs in the afternoon to evening (it's not hot). when I surf or do anything else on the phone, the mobile phone turns off immediately without a hitch. when I turn it on again, the problem occurs only after entering the pin within about 2 minutes. when I throw offline mode (plane) I can be on my mobile for an hour and on the wifi and the problem does not occur, as soon as I turn off offline mode, my mobile phone turns off again within 2 minutes .. it never happened to me in the morning .. I tried another sim and problem is the same.