IMac keep shutting down after installing OSX lion

Hi,
I have a mid 2010 27 inch i5 machine and after I had installed OSX Lion last month the machine randomly shut itself down while I'm using it. At first I thought it was because of a software problem with Final Cut Pro X, since I installed that at the same time and it would shut down while I was using it. Then it start to shut down while I'm just browsing the net. Restarting is not a problem but a pain to loose unsafe data when it crashes.
Does anybody else have this problem? Again the machine was working fine before OSX Lion so I don't think it's a hardware issue. On average it would shutdown once or twice per usage day sometime a few minutes after turning on the machine, still cool, and sometime after a while, not excessively hot.
Appreciate any help and thank you in advance!

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IMac keep shutting down after installing OSX lion

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