I have Smart Standby mode set with it coming out of deep sleep between 7pm and 11pm in the evenings. However today I noticed that it is sticking in light sleep mode outside those hours. I have tried power-cycling the box using the power button.
It looks like I have had a firmware update overnight as the EPG positioning behaviour has changed. It now positions the new channel selected at the current line of focus whereas previously it always positioned it as the second line on the screen. I also note a new setting for turning on or off marketing spam that was not there before.
Update: Just discovered there were two linked devices (no details) showing in Settings. Don't know how or why as though I use my laptop and tablet for BT TV / Sport I haven't recently and I make sure they are *not* linked to my YV box precisely because doing so stops it going into deep sleep. So what happened there then?