One of my 7 HR boxes has recently started having video and audio dropouts/breakups/freezes and 771 Search for Signal messages. I've watched other boxes on the same channel at the same time and they are all fine. They are all on a SWiM. The problem box is an HR24-500 and has always been fine previously. I can't think of anything that has changed in the environment. I appreciate any suggestions on what the problem could be or things to try.