My Mac sticks at the power down

Hi!
Since 1 week my Mac sticks at the power down. It says "unmount of /net failed (45)" and doesn't go to "done...", "CPU halted" and "AirPort en1 down". It just stays there. I can make some new lines and type in something, so it's still running, but doesn't go forward. This happens only if I use my Mac for more than 1-2 hours. If I boot and shut it off after 30 minutes or so it works.
I read many things about such problems. I repaired the permissions and reintalled Mac OS 10.6.6, but this doesn't help. I don't use MobileMe and the iDisk, so this can't be the problem.
Here are 2 logs. Maybe someone can find out why. I uploaded it to pastie.org, because it would be too long.
http://pastie.org/private/4fkcvd7msdqeuidkmymaca
http://pastie.org/private/goprcnq4zav3kz0kdtvwg

Sorry for the push, but I found something out: If I sticks at the power down it says
04.03.11 23:32:21 kernel Kext loading now disabled.
04.03.11 23:32:21 kernel Kext unloading now disabled.
04.03.11 23:32:21 kernel Kext autounloading now disabled.
04.03.11 23:32:21 kernel Kernel requests now disabled.
and doesn't do anything (I waited 15 minutes until I pressed the power button for 6 seconds). If I turn it off after 10 minutes or something like that it just says "systemShutdown true" and then it is off. This Kext messages appear after the "systemShutdown true" if I use my Mac for more than 2-3 hours or something like that. Does anyone know what this means?

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< Contact Info Edited By Host >

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My Mac sticks at the power down

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