If I am in an area where WiFi is not available or where the WiFi requires a password I don't have, my phone will either turn off WiFi automatically or I turn it off with a toggle app. At that point, 3G should automatically come back on, and it usually does. But sometimes, nothing happens, so I go into settings and discover that the checkmark for "Enable data access over Mobile network" is gone. If I re-check the box, all works as it should. Any suggestions about what might be causing the problem or -- even better -- how to solve it? It's not a major problem to turn 3G back on manually, but i usually don't notice it's off until I've wait a minute or so for something to download. I have a Droid X and am using Green Power and Juice Defender to help control the battery.