@SassyH A few of us have had the same problem in the past few days. It was resolved for me in my Gen Two set by speaking to Sky Technical and going through a hard reset of the TV. It is something they prefer to do whilst on the phone to them in case of problems. You can find the number for Sky Technical via Google because we can't post numbers here.
You won't lose your Playlist or Continue Watching selections but you may need to go into Settings and re-set picture, sound, stand by options etc back up to your preference. If connected via ethernet cable you may also need to turn WiFi off again.
It's also worth ensuring that you have Networked Standby mode set to on.
