GA-Z77X-D3H LAN disconnect problem during data transfer

[Vip3rz]

Hello dear forum members,

One month ago I bought a new computer with a pre-installed Windows 7 Professional package on it. Now, every time I try to download a file or try to upload a file (big or small files, doesn't matter, FTP or browser, doesn't matter), my connection disconnects for like 30 seconds and then recovers. This is what I already tried:

• Updating all the drivers for my motherboard, cpu, networkcard you name it..
• Updating the BIOS to the latest versions
• Plugging in a new PCI network card and using new drivers (disabling the onboard LAN)
• Settings for my network card to full / half duplex, tried them all
• Disabling 'save power by turning of this device' settings
• Resetting the TCP/IP stack

The weird thing is that when I startup my PC in safe mode, the problem doesn't occur! I read on the web about a 'clean boot' (disabling all the services / startup items via msconfig and then reboot) The weird thing is.. on a clean boot with everything disabled the problem still occurs! What could this be? If anyone has any idea this would make my day / weak / year / life! =)

Mainboard: Gigabyte Z77X-D3H (using onboard LAN)
Processor: i5-3570K

With Kind regards, Stan

[shadowsports]

If it worked previously, and you haven't changed any hardware, chances are the problem is software related.  Also indicated since it works in SAFE mode.

Use system restore and go back to a point in time when things were working.

If you have a Back Up image of your PC, this too might be a possible solution.

[Vip3rz]

Update:

I used the windows event manager to track down the problem. It seems like the problem was comming from my router. I downgraded the firmware of my Sitecom WL-351 to 2.4 (latest version is 2.5) and the problem dissapeared. 6 Months of losing time and getting irritated, all gone!