Last night, as I was getting ready to go to bed, I went to set my alarm and my phone shut down. When it started up, there was some form of message--I wasn't quick enough to catch what it was. Then suddenly, it was back at factory defaults. My apps are gone, my accounts are all signed out. I am confused as to how this happened, and worried it could happen again. Any insight would be welcome. Part two of the annoyance is that now when I try go into the System menu and change my sounds--notification or ringtones--I get the message "The application Settings (process com.android.settings) has stopped unexpectedly. Please try again." I've turned the phone off and on again and tried again several times. I've been able to change other settings--language and keyboard specifically--but not the sounds. I'm confuzzled. Help!