I am using the wifi router of wr845n, where my isp speed is 50mbps. when i uses the wlan am getting the same speeds, but while using the LAN my speed is restricted to 10mbps.

When i checked the settings on pc it shows connection speed as 10mbps. suddenly on a day the connection speed changed to 100mbps (i think the probablity is 1 in 30times of LAN usage via pc), after i restart my pc the speed again lowered to 10mbps.

I have cross checked the quality of cables, resetting the router, changing the ports, scrolling through admin settings,etc. It will be a great help if anyone helps me to set the connection speed to 100mbps