Unbranded, fully updated (2.1-update1), Desire. Three months old. No task killers installed. Just this past couple of days I've noticed it has not been showing the data connection symbol in the top bar, next to the signal strength bars. Try and connect to the internet or the market and get a 'failed' pop up window asking to either retry of cancel. Retry never works. I go into settings > Wireless & Networks and disable Mobile Network, then enable it again and it flickers on then goes off again. Repeat this and it stays on for a while but always goes off again after about 20 minutes even though the Mobile Network is ticked green. Why is this happening? I'm missing emails because of this and it's a bit of a pain. Anyone having any similar problems and/or know a fix?