Look around the manual about plug and play or home mode. Shop mode returns it all to factory every so many minutes.
I've returned all the channels ok after 4th April changeover.
When turn TV off and turn on again all channels are lost and have to re-tune again.
I've tried looking for factory re-set, but cannot find the right one. tried mute, 182, power, but this does not work.
I would appreciate it if anyone can help