MacBook Pro, Intel Core2Duo, 2.4GHz, 8GB RAM-Throws me out of Profile & back to logon screen.  Any ideas?

In the last month I have had my Macbook Pro freeze up on me twice then throw me out of my profile and back to the logon screen.  When logging back in all my data/ programs that I was previously using have been closed.  This has happened when I have been multi tasking, as well as running a VM.  Obviously I dont know when it is going to happen so I have not checked the resources to see how much RAM is being utilised at that point in time.  What I would like to know if that behaviour typical of a Mac when it is running low on resources, bearing in mind I am using 8MB RAM?
Thanks,
CRS

That should read 8GB's of RAM

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