MBP running hotter than usual and shutting off randomly

Hey everyone,
I have a MBP 2.16Ghz, it's about 20 months old. About a year ago I had some problems with it and Apple replaced my battery and my motherboard. The machine was running fine without any problems. This week I realized that the MBP was becoming hotter than normal and that the fans were running a lot more frequently. Eventually the MBP shut down on me randomly while running it on an almost full battery. I then decided to reset the SMC and re-install the Intel 10.4.11 combo update. While using the MBP on a full battery, once again the fans kicked in while just surfing the web. The fans would never turn on before while surfing the web. All of a sudden the MBP just shut down on me. I really have no idea what the problem could be. Unfortunately I'm out of warranty. If anyone has any suggestions or similar issues please do post. Thanks.

Thanks a lot for your reply. I did run the Apple Hardware Test and after running both normal and extended tests no trouble was found. I managed to download the widget called iStat Pro, I realized that my CPU was idling at 50%, and the CPU temperature was 80 degrees Celsius. This caused my fans to run consistently at 6000RPM. I discovered that the random shut down while running on the battery was caused by too much current being drained by the system. So as you suggested, it was indeed happening for safety reasons.
By looking at the Activity Monitor and selecting all processes I saw that a process called printjobmgr was utilizing 100% of the CPU. I found this strange as I had performed several restarts and would have expected this process to terminate on its own. As soon as I used Force Quit, everything returned to normal. Strangely, every time I print something, the printjobmgr starts up and utilizes 100% of the CPU. This lasts until the printing is finished. I still was unable to find a permanent solution to this.

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MBP running hotter than usual and shutting off randomly

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