Settings Keep Changing back 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.
When the battery is low, the phone will turnoff services/processes, like sync, to save energy. It may help if the phone is kept charged.