The last couple of days all three of these channels have not been working. Sometimes they freeze sometimes i cant get any picture at all. No signal being received came up the other day. This is on a sky+ box,we have one other sky+ box and three normal boxes and all is ok with them. I was wondering if i have a problem with the box or is it anything to do with why we are getting new cards sent out soon? I have done all of the unplugging and testing that i usually do but nothing changes.