I am fairly new to Android. This problem started a couple of months ago with my Samsung Galaxy Tab A ( I see most contributors have phones so there are some differences for that reason alone). Someone way back suggested waiting for Android to release a fix and here we are a year later still struggling with it, like a disease with different causes, different symptoms, a wide variety of different cures affecting victims in different ways. I have only a couple of the apps suggested as culprits, removing them had no effect. Probably the cure for what inflicts my tablet is somewhere in all these posts, but how do I identify it? I am starting to suspect some apps which permanently display floating buttons.