Evo has locked up on data connection.One minute data is working great and then, No internet, app store, etc. and anything I try to do brings up a dialogue box that says retry or cancel, and that I need internet network access. Phone still works, but does occasionally seem to not hang up on first try. When I go to settings - wireless & networks, it shows a box "trying to connect" but nothing happens. 4g, bluetooth and wifi are turned off. I have to completely restart phone and the data is back. This has happened about 5 times. Phone issue or Sprint issue. I am in Atlanta, and can get 4g coverage around my house and area. 3 g goes from great to low in same spots.