@johnphaff if you have a look at the posting Sean has just put up today, there seems to be light at the end of the tunnel. To save you reading a very long thread, it occurs where there is strong transmitter overlap and as a result, the YouView box tunes some channels from the expected transmitter, and some channels from an alternative. This is to an extent normal/expected behaviour and will be happening on your TVs too - but you probably don't realise it. i.e. most people would assume that you get your channels from the transmitter your aerial is pointing to and/or the preferences you set after tuning - but RF signals don't always behave in the way you expect, and you can get perfectly strong and usable signals from the sides and back of your aerial.
The trigger event (not the cause) is minor changes to Freeview that are periodically broadcast and then processed automatically by a Freeview device - but in our case, they cause the YouView box to throw a wobbly and delete the channels it tuned from the alternative transmitter, requiring a manual re-tune to bring them back. There have been many such changes over recent weeks as you can see from this log https://www.rxtvlog.com/p/freeview-updates.html but there is evidently a change freeze over the festive season with the next event being 7th January by the look. BT are evidently making progress on this so maybe we might even have a fix before the next event.
