Wired ethernet stops working on c2d MBP

I am a new 15 inch C2D MBP owner and I'm just starting to learn all the Mac stuff... I need your help because I have a serious problem with wired ethernet stability under macOS. I need to know if it's something specific to my machine or if anyone else has similar problem.
I am connected to a LAN with a 10/100 Mbit switch. I'm using a good cable (checked!). And my connection seems to hang from time to time. Usually this happens under heavier load (torrent plus multi-tab browsing), but it dies sometimes during casual browsing or checking for system updates. And it's anywhere from 3 minutes to 12 hours between hangs...
The symptoms are strange. The connection seems to be on, but there's a sudden surge in bad packet received number and the network connection stops working remaining on-line. Putting the machine to sleep or manually shutting down the line helps immediately. I'm using:
sudo ifconfig en0 down
sudo ifconfig en0 up
At first I suspected hardware problem but the same line works perfectly under Windows (with even higher load, and tcpip.sys patched to 1000 connections).
It acted like this from the very first moment I got it and I have no clue if I should contact service or wait for a patch or maybe just stick to Windows (just kidding)...
I've browsed the forum and it seems I'm not the only one with the problem:
http://discussions.apple.com/thread.jspa?threadID=649927
but this topic is unsolved... There's nothing really strange in system.log:
Dec 15 17:22:45 honsiu kernel[0]: AppleYukon: bad packet received. length: 20, packet status bits: Packet fragment
Dec 15 17:25:01 honsiu sudo: Janek : TTY=ttyp1 ; PWD=/Users/Janek ; USER=root ; COMMAND=/sbin/ifconfig en0 down
Dec 15 17:25:04 honsiu sudo: Janek : TTY=ttyp1 ; PWD=/Users/Janek ; USER=root ; COMMAND=/sbin/ifconfig en0 up
Dec 15 17:25:05 honsiu configd[41]: posting notification com.apple.system.config.network_change
Dec 15 17:25:05 honsiu lookupd[13803]: lookupd (version 369.6) starting - Fri Dec 15 17:25:05 2006
Dec 15 17:25:05 honsiu kernel[0]: AppleYukon - en0 link active, 100-Mbit, half duplex
Dec 15 17:25:06 honsiu kernel[0]: AppleYukon: bad packet received. length: 21, packet status bits: Packet fragment
Any hints appreciated. It's a beautiful machine and I'm so sorry it doesn't work as it should...
15inch C2D MacBook Pro Mac OS X (10.4.8)

evans_re,
does the trackpad not work? If it works, you could try selecting “Shut Down…” from the Apple menu.
As a last resort, you can hold down the power button for approximately ten seconds, which should force a (non-clean) shutdown.
If your keyboard is completely non-functional (excepting the power button), then you should take it to an Apple store or other qualified service facility.

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