I am currently having problems with inconsistent and slow internet connection. My superhub is connected to my computer via a Belkin Powerline AV model: F5D4074-S v4. There are aprox 6 walls (but only about 20 meters) between the two plugs, which i believe it should be able to deal with.
Does anyone have any suggestions on how to fix this
First of all I would test the connection directly connected to the hub, taking the Belkin out of the equation.
Powerline adapters can be adversely affected by noise on your home's electrical circuits, apparently mobile phone chargers are quite good at injecting noise into the electrical circuit. I take it that the powerline adapters are plugged directly into an electrical socket and not through a power strip.
The connection directly connected to the hub also has a tendency to be very slow at times, normal connection speed is around 120Mbps but at times it has dropped down to below 1Mbps for a couple of days. The power line adaptors are indeed plugged into an electrical socket.