OS X 10.6.7 suddenly quits and returns to log-in page

rafaelmacho

Registered
My macbook pro 2010 is running 10.6.7 4gb of RAM, Hard drive is 70% full. For no reason, OS X suddenly (with any running applications) quits and 3 seconds later I am at the starting log-in page. All apps or open files are gone, I need to type my username and password. When my computer is turn on, I don't have any log-in usually, it automatically boots.
It happens about once every months or two.
 
Hi Rafael,
When that has just happened, what shows in Console (/Applications/Utilities) as the events around and just before it happened?
 
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