Keyboard and touchpad do not respond temporarily

Hi all!
While working on my Macbook Pro mid 2010 (Mountain Lion) the keyboard and touchpad sometimes don't repond. Everything else on the Macbook seems to work as usual, e. g. the power button works and I can see how the logfiles are updated on the console. Currently this problem occures about one time a week
When I close the lid, the Macbook goes to sleep and when I open the lid again, keyboard and mouse work as before.
In the logfiles the only that sounds to coorespond to the problem is:
AppleUSBMultitouchDriver::validateChecksum - 512-byte packet checksum is incorrect
But the time when it occures doesn't correspond to the time when keyboard and touchpad stop responding.
SMC and PRAM reset did not solve the problem. Maybe I have to mention that the logicboard was replaced 2 month ago and can't remember that htis problem accured before.
Any help is appreciated.
Diedel

elpolly,
You may look at some of the Other options, especially Items 15) and 7).

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Apple will not support unless you have bought a support package and is now offering to sell you this package.
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Makes me ponder the thought that this is all a scamm to get more money out of the customer and this program (virus) was purposely loaded during one of the updates.
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Excuse me, but i'm a newbie. I'm not sure if this is an arch problem, but i will just post it here.
I've beening using Arch64 and it works just fine. However, every time i reboot from arch into Windows 7 (32bit), the keyboard and touchpad will stop responding just when the Win7 splash screen shows, however the mouse works fine. Then when you shutdown the computer (from win7 now) it will take apparently longer time, and sometimes i have to press the power key 5 seconds to make it shutdown.
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Hi!
That is indeed strange. Since your external mouse works fine (which probably is connected via USB, right?) it appears that the problem lies somewhere around the internal keyboard/touchpad access. I'm not sure how this works with a Lenovo Y450, but just try to enter BIOS (in case you have not been there, you probably have to hit F1 or F2 during startup - less likely it would be delete or escape ...) and look for your keyboard/touchpad options.
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