I retuned my Freeview cards today as i got a second Nova-T. However i now seem to be missing several channels and they dont seem to come back if i retune several times
Presumably you used an aeriel splitter to allow you to feed the second Nova-T. So now the problem is that your signal is too weak & you are losing multiplexes. You will probably be able to fix it with a 1-in 2-out signal booster that cost about ten pounds from Argos. If that doesn't work you may need to upgrade &/or realign your aerial.