The TP-LINK support guy tell me that my settings of realtek adapter is WOL & shutdown link speed and the speed come back when I change it. I think your settings is Reduce Speed On Power Down. You can...

Hey, This settings may cause this issue. Right click your network connection and click properties --> configure --> advance. Change the 10Mbps First to not Speed down .

I have have a C2 too and this issue exists on it. Did your wireless speed drop off?

If you unplugin the ethernet cable and replugin it to your computer, did the speed come back? Also, this is your network topology? PC1---C2---PC2, I think this issue is related with the switch chip...

Hi guys, please tell me the associated speed (link-up speed). I think you can test with this topology: PC1---(lan)C7))((PC2(T4U) You can transfer a big file from PC2 to PC1. This test can show you...

I suppose this problem is related with the associated speed. Did the associated speed drop to 10mbps or 100mbps?