I have a black banner appearing at the top of my screen during playback of any source.

The banner shows which HDMI port I'm using 'HDMI 1', screen image quality '3840x2160p' and the current time. It's appearing randomly (as far as I can tell) and often constantly (every minute or so for about 10 seconds) 

I've performed factory reset and software update. 

Does anyone else suffer from this / know how to disengage?  

Many thanks

Mike