Just a note for you had a belkin for many years and had to reboot it on the stb connection often.
Tried a actiontec and it was similar having to reboot, using us robotics now works perfect
From experience check router especially belkin ones
also check the stb return path and snr values.
details here
http://www.cableforum.co.uk/board/sh...ad.php?t=26006