This has been a problem with the DX since I don't remember but seems to be getting worse instead of better under GB. After I leave home (WiFi) and go somewhere I no longer have 3g unless I reboot. This used to happen maybe a couple times a month on mine but seems to happen a couple times or more a week now that I have GB. I am using a completley stock DX too. Anyone elses gettting worse instead of better?