I have on old Ondigital Box upstairs and can get good signal strength on CH3, 4. Downstairs I get all the channels normally but today no 3 or 4. Previously a small wiggle of the aerial cable in the wall socket and it would come back which pointed to a poor connection or so I thought so squeezed the middle pin in the wall socket to make sure of a tighter connection and still no joy. I re-tuned the TV and now its not picking up 3,4 and also 13-15. I would have thought if the wall socket was faulty no channels would be received but I get 80%+ on all the other channels. Software is up to date on the Panasonic PV500 plasma I have and no planned ones according to Digital TV Group. The signal is split in the loft albeit I got a massive Digital aerial installed by a trustworthy installer. Is it possible the wall socket could be at fault given its only CH3 &4 I can't get. I have just tried the digi box downstairs and same issue no signal on 3 and 4.