Problem hanging that I can't seem to fix

I generally leave my MBP on all the time. Twice when I've returned to it over the last three days, it is locked at the desktop. It has not gone into sleep mode and I need to press the power button in order to restart the machine. Of course, it then takes about 2-3 minutes to restart, with the Apple Logo screen showing the spinning thingy and the blue screen appearing before the desktop finally comes up.
The MPB is about 16 months old and seems to run well when things are up and running. It has 2 gigs of memory (that appear to be ok) and my hard drive seems to be ok too, according to the Disk Utility program (though I have not run that off of the DVD.
Any suggestions would be very much appreciated. I've had zero problems until the last month, but some little things are happening that have me concerned.

I do periodic maintenance and repaired the permissions. I also reset the pram and also the SMU last evening. I am hoping that will help. This has happened so randomly, it's hard to know what is making it happen or what will fix it. We'll see!

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