Just an idea,saw it on a site somewere.
Try changing the transmit rate on the router from 100mbps to 10mbps see if that helps.
It is in advanced network settings .
Open a web browser and enter
192.168.0.1 and press Enter. When the login window appears, set the user
name to Admin and leave the password box empty. Click Log In to continue.
You can always change it back if no good.