I have had the same problem for eight weeks.
Then Kitaro1 sent me a ziggo technician home. The problem was the I had mounted the amplifier as described in the booklet/manual but not the contact box/doos at the very end where the TV is plugged in.
I would suggest that you verify whether you really used the contact doos supplied by cisco and whether it is mounted correctly! The fact that the receiver says signal level & quality 100% does not exclude an error in the contact doos!