Slightly different problem for me if anyone can suggest a remedy.
Upgraded to 50MB, and was using the supplied D-Link DIR-615 router. All working fine, with speedtest.net showing 50/1.5 max.
Now while the DIR-615 seems to be a great little router, the one thing it lacked for my network was Gigabit connection for fast file transfers between PC's.
So i got a DIR-825 which a lot of people say is a great router.
However, I cannot seem to get more that 9MB/s download through this router.
I have tried updating the firmware to the latest version, disabled QOS, disabled everything that wasn't necessary, without any difference in d/l speeds.
Switched back to the 615 and speeds were back to normal.
Looks like I will have to make do with a 100mb LAN unless someone has a bright idea...
anyone?