Try this...
In Menu, set the receiver to the factory setting... this deletes all the channels.
Then scan the bird that your dish is pointed at.. let the channels add on its own.
You probably uploaded a channel list that has a lot of channels without having the all dishes to support it.
I was having the same problem and I tried this... now everything's all good.
There's probably an easier way, but I know that this way works... or at least worked for me.