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Windows 7: Ethernet TCP Latency, PC freezes, Msn msgr freeze, lock up, hang

27 Oct 2010   #1

Windows 7 Pro 64bit
Ethernet TCP Latency, PC freezes, Msn msgr freeze, lock up, hang

Hello everyone.

I am currently owning a very sweet notebook, Sony Vaio Z Series VPCZ12.
Ever since I bought it, there was an issue with random freezes, lock ups and such.
Those freezes would happen 4 hours after boot, sometimes 10 hours...

I have basically diagnosed the whole pc, I have all by myself tested different things.

Finally after a month of testing the notebook everyday for like 10 hours, I realized where the problem was.

The freezes are caused by my network adapter. And yes, I do have the latest driver for it.

To be more specific, what happens is:

1.) When opening a chat window in msn messenger, it first shows a blank, white window for 3-5 seconds, and then it becomes normal.
2.) While browsing internet, the screen freezes...hangs...the browser is not working good at all...

So what have I noticed?

During the freeze period, i went to the Resource Monitor, and checked the network diagnostics...
And what I found out is, that during the lock up's/freezes, the TCP connections have latencies between 250 and 400ms! ( normally the latencies are between 0 and 60 ) HAHA! Gotcha!

Uploaded with

What I have also checked is, when the freezes occured, I disabled the network card in the device manager, and enabled it again, no freezes for a next couple of hours!

My question is, what could be a cause of this?

In addition, it has all been performed on a clean OS right after a format.

Any ideas? Help appreciated The laptop costed me 2000 pounds, and it is sort of useless right now...with all those freezes.

My System SpecsSystem Spec

27 Oct 2010   #2

Windows 7 x86/x64, Server 2008r2, Web Server 2008

It sounds like its your network card... return the Laptop and exchange it Or contact sony....
My System SpecsSystem Spec

 Ethernet TCP Latency, PC freezes, Msn msgr freeze, lock up, hang

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