I'm a novice so bear with me. I've been losing signal and the use of my Sky+ box over the last 4 days or so. My original Sky box (now in another room) continues to work, except for a brief period about 2 days ago. I've tried the usual switch off/on, reset LNB, full system reset but the problem persists. Anything else I could try before succumbing to the £65 call out fee?