As title suggests when putting tv into standby it fully powers down and requires a full boot up from cold when i come to it next.

This seems to have been happening only over the past week. Have had the Oreo update installed for a month or two.

The only thing that has changed is adding Chromecast Ultra and making sure CEC is on so chromecast can turn the TV on (which ironically doesn't work now as its not in standby). Any ideas?