Got a new BT tv box several weeks ago. Since then,every night, the tv has switched off at the same time (12.05) saying no signal. We are not watching through the bt box when this happens.
If we then put bt box on ,we get channels fine. go back to ordinary tv,still saying no signal. It eventually rights itself.
Sorry,not very technical but there must be an easy answer to this!
The box is probably dropping into "sleep" mode. You can check by selecting Youview>Settings>Device Management>Standby Mode via your remote. You can then adjust the time the box drops into sleep mode to suit your lifestyle.