Slow network connection/internet until unplug - plug cable twice.

Hello,

I have been experiencing a weird situation: On a second computer connected through a network cable, placed in another room 6 meters from the router (canyon something wireless router) I am almost always experiencing veeery slow internet/network speeds after windows starts.

If I open a browser, the first part of the first website that I open seems to load fast, then it kinda just halts and I'm waiting for like 2 minutes to completely load. If I try opening another tab in the meantime and try to open Google for example, it doesn't load at all, or loads very slow.

I suppose I could say internet comes in short bursts.

However, if I unplug the cable a couple of times from either the computer or the router, it then works like it's supposed to. for a while, then it kinda starts acting funny again. Thing is my GF is using that computer and she's always whining about the connection.

Through the same router on another port I am experiencing no problems at all. I tried flashing/upgrading the router's firmware, replaced the UTP jacks on the cable, uninstalled the network card from device manager, fixed IP, DHCP, no matter what I do it still behaves the same.

Does anybody have any idea?
Thank you!

Thanks lyleb, I've tried everything and narrowed it down to the hardware on that machine.

With a different network card I got for free from a friend the connection is lightning-fast now.