OK. Thanks for taking some time to reply
I'll try and find a spare box I can borrow from someone to at least try and confirm or eliminate the receiver as being a cause of the problem.
It just seems a bit of a coincidence that everything was fine last week using the
Sky minidish and then this week after having swapped over the dish & LNB for different ones that I start getting a problem.
You say "high band channel". I'm afraid I'm still a bit of a novice at the moment and still learning so I'm not entirely sure what "high band channel" means. Can you possibly expand a little further please.
Also, if my problem is possibly related to high band channels then are there any other channels in the high band range that I can also check to see if I'm getting the same issue on those as well?