After 7.0 update on galaxy S7, the volume will automatically un-mute itself at random times.

[AC Question]

When selecting the drop down bar and selecting buzz or mute sound, at some random time later, the volume will go back to full and the icon changes back to un-mute. I tried factory reset and settings reset. Problem continues. This happens when in pocket or sitting on table. Doesn't matter if I have an app up or not. I notice it whenever I get a text message or phone call and I can hear the tone when I shouldn't because I had set it to mute... This problem only started after the 7.0 update. Factory reset kept the 7.0 version. Phone is not rooted.