Mac book pro needs to force shut down from power button after upgrading lion.

I had upgraded my mac book pro to os x lion from snowleopard but on 2 days while i was suttig down i waits 10 -15 seconds that it says that i had to force shut from power button . this is really bugging me . what could be the problem ???
Than you for your answers.

I had the same new feature with Lion on my iMac 24".
try to repair access privilegs.
Try Resetting the PRAM
If that doesn't help, try Resetting the SMC

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