I had the problem with this issue. After having a very good tech out here, it came down to the WNC LNB. It has been very cold where I live and the tech has seen the issue and replaced the LNB with the Eagle Aspen and it works great. He said that he had seen the issue on the SWM WNC and now he is seeing it on the Slimeline 5. He tried to replace the IRD and it did the same thing. But the LNB was the whole problem. Give it a shot.