Blue Screen- seems like random logon/off of user account

Hi,
I recently bought a new Macbook Pro (at the end of November) and have had this problem occur a couple of times. I'll be on it and it the screen will turn blue for a couple of seconds and then my desktop pops back up like I've just logged on. It's like I've logged off and on my user account and closed all my applications in the process. The first time it happened was several weeks ago and the blue screen appeared just after I opened the computer up after it had been closed. Every time I went down to the dock, I would get the blue screen. I restarted it and it seemed to be fixed. However, I experienced the same problem again tonight. It happened several times and at one point the only application running was Safari. Again, it was after the computer had been closed and again, I shut it down and it hasn't happened again. I'm going to call Apple tomorrow but wanted to see if anyone else knew what was happening. I have no experience dealing with computer problems so don't know what to look for to tell me what is happening. I did try searching for old threads on the topic but couldn't find anything.

So, to be clear, it will "logout" in two situations (and not prior to 10.6.5):
1. After leaving the computer unattended for a while, it will awake with the blue screen (not the "death screen", that's a different issue).
2. In a memory intensive, or several apps open,situation, a new command will trigger the logout. I've always run that style without issue.
Not a shutdown since there is no grey screen, and blue continue to normal desktop.
Not a restart since there is no grey screen or chime.
Not a kernel panic since no alert and grey screen, etc. Also note that there is no memory loss in your browsers so it is a calm logout that saves during the process, crashes remember several pages before the event, not the last one. Applications seem to save to the last second as well although it hasn't happened while writing a document so I don't know (I save at almost every breath anyway while writing).
No difference from increasing RAM to max.
No difference from several restarts (a process that used to clear memory blocks, don't really know if it's still relevant with the newer architecture). Anyway, it's a random event so hard to blame a memory issue (i.e., it's not repeatable).
No difference from standard troubleshooting processes, permissions, resets.
There are a lot of complaints about this issue but most people don't see it as a logout issue. Probably because they are single users. However, reading the restart and blue screen issues, tells me that they are discussing the same issue.

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