I've had similar problems as
ched with channels being forgotten as freeview and switched to IPTV. Also constant picture break-up and freezing due to bad broadband signals.
My other problems are with recording long programs (ie movies) more than an hour. I go back to replay them for the first time and it will play the first 2 mins and then crash back to the main menu.
Contacted customer support a few times with very lengthy emails detailing the exact problems and typically get the response back "I have reset your network settings....blah blah blah".
I just can't be bothered anymore and will probably switch to another broadband provider and stick to freesat or plain ol freeview