Why is my samsung galaxy s5 showing mute for a day and the entire screen turns blank for days

Over a week ago an icon normally arrived on my screen, it floats on top of every screen or app. Round dot with a remote in it, and if pressed displays "mute for a day,go to settings to disable". I have no idea where it came from or where in settings I should go to get rid of it. I have already disabled notifications from Peel smart remote

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