The settings keep going back to factory settings either when the battery is low OR I turn off the phone. For example, calendar sync turns off and I have to turn it back on each time I want the calendar to sync. The display goes to the least brightest settings and 15 seconds for screen time out and I have to go in and readjust the brightness and screen time out time. It is really annoying. When I took it to the Sprint store and asked them about it, of course, it wouldn't do it.