15" Mac Book Pro Problems When On for more than 2 Hours

I have been using Macs since the original 512, and this is the first time I have had out of the box problems that appear are not related to software issues.
We purchased a 15" 2.2 GHz MacBook Pro the end of August, and very quickly it begain to have issues. After the computer has been on for 2 to 3 hours, its first problem is that it will not print documents from PowerPoint or KeyNote, and it will not save them as a .pdf file. Within another 15 minutes applicaations will begin to quit, or not work correctly, and at that point Safari documents will not print. It will still print Word documents.
If I try to restart the computer, it will just display a blue World Globe, and not restart. However, if I let it sit for 4 or 5 hours, the computer will restart and work perfectly as if nothing were a problem. I have run DiskWarrior on the computer, as well as the OS X drive repair and preference repair, I have defragmented the disc with Speed Tools, and the result is the same. After several hours it begins to have a variety of issues start to crop up, so I am guessing that it might be a defective processor or board? The first time this had happened, I took it in for service, and when I turned it on it worked perfectly, and they could not find anything wrong.
I am missing something or is it time to take it back to the Apple store?
Thank you for any insights!
Dudley Bogart

Michael,
Thank you for your input. Unfortunately, I did not have this connected to our network, but the very strange issue is the fact that its functions deteriorate after it has been on for a while, and then will miraculously disappear after it has been turned off for several hours! That just really makes it hard to track down some logical problem, unless it is related to hardware such as a board or processor issue. Since the computer is not really crashing, there is not really anything interesting showing in the crash logs--it just will not restart right after the deterioration in performance.
I hoped someone else might have seen such anomalies, and could point me in another direction.

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From: [email protected]
To: [email protected]
Subject: PSE 6 on Mac Book Pro Crashes when opening a picture
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