Whenever I turn my TV on it automatically loads up a trailer from Google Play.  Its extremely annoying when all I want to do is be taken to the home screen so I can launch iPlayer or whatever.  Instead I have to hammer away at the stop button to try and get the trailer to stop - most of the time it doesn't and continues to play in the background until I launch another app.  I'm also presented with a screen saying "New channel source available".  This has only started to occur in the last month or so.  

Anyone else have this issue or can suggest a solution?

I do not have an aerial or dish connected to the TV and rely on streaming content only  (but that does not include Google Play which I never use)

TV: KD-43X8305C Android 6.0.1

Thanks