First of all do a planner rebuild this is done by pressing services button then move across to settings then press down once then press 0 then 1 then select then move across to rebuild then press select then select again once finished then do a software forced update this involves removing sky card and unplugging from mains hold down backup button on skybox (not remote ) whilst plugging back in keep holding for at least 15 seconds box should start downloading software it takes about 5 to 10 mins the screen message says 10 but it's approximate. Hopefully it works but if problem persists it is a signal issue either cable damage dish alignment or outside interference caused by things like cordless phone base being too close to sky box or even Internet router being too close to sky box . Hope this helped a bit let me know. This is for a HD box? If its normal box just look for services button, 4 ,0,1 select then 7 for rebuild. But it does sound like you should insist Sky come out and rectify the problem x