I have a few of these boxes dotted about and with the newer firmware some of the boxes loose quite a lot of channels. I have found if I change the quad lmb from sky to a single lnb the channels return with a grater signal strength than before. I do have a octo lnb on a zone 2 sky dish. I swopped out this quad many times with various lnbs from sky. I fixed the problem with a expensive top of range inverto pro octo lnb. signal bumped up quite alot. It might be worth trying this if you suffer from this problem.