After switching my SONY TV to standby (off), occasionally audio can be heard coming from grey grill on the top of my Swisscom TV-box. It was spooky at first. I had no idea the TV box had a speaker in it. The microphone is always off using the side switch, confirmed by the red LED. When it occurs it is normally within a few minutes of switching the TV off and then dialogue can be heard occasionally for up to 10 minutes afterwards. The box never makes a sound when the TV is on. I have the UHD TV box with voice assist and OS4.
Does anyone else have the same issue, or do I have a ghost in the machine?