Have you tried a matrix reset (disconnect input to your receiver, do a check switch, reconnect the input from your dishes to your receiver and do a check switch again)?
It might fix (or help fix) that issue. I'm way further north than you are and don't get drop-outs like on the channels on tp 27.
It might fix (or help fix) that issue. I'm way further north than you are and don't get drop-outs like on the channels on tp 27.