When i switch this tv on it does not always recognise the hdmi connection to a sony HT-AS5 surround system and therefore no audio.The cable is a sony one which is good ,tried others same fault .Now this is only on startup and is intermmittant easily solved by switching off and then on again. The hdmi connection is on hdmi port 1 which is ARC,I don't know if anyone else has had an issue similar to this ?