IMac freezes after lion upgrade

Upgraded imac from SL to lion, and now the computer freezes when waking from sleep or switching accounts. I have no issues during the process of using the computer. I have installed new RAM (4gigs), reinstalled the OS, erased the HD (securely) and rebuilt from back-up, pram, disk utilities, disk warrior. Read in one post that this may be the logic board and that Apple may be replacing these in certain modles. I never had the computer freeze when I was running SL, and I am a school IT guy with over 100 macs running SL and this does not happen at school. I have heard from others of the same thing once they go to Lion but the Apple Store says they have not heard of it! Do not see how this could be a hardware thing since it looks to happen after Lion upgrade.
Any ideas

I did do the above as I read that may work too, I also made it so the HD never sleeps. Did not help for me, computer still freezes when switching accounts, not all the time, on average every other day I need to do a hard restart.
Still looking for the answer

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oh_okay
Level 1 (0 points)
Re: Safari Crashes on Opening after Lion upgrade!
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[click on image to enlarge]
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IMac freezes after lion upgrade

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