Support Unexpected Factory Reset, and now I can't change my sound settings!

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http://androidforums.com – 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.sett (General)