There's a weird icon that shows up once in a while on my Galaxy s6. It'll be there sometimes in the drop down bar and the backlight for the back arrow and task manager "buttons" will light up. The icon pulsates (a gray circle with a gray circular line that comes and goes around it. It isn't a sync icon or any icon on any list I've found yet). Every time I try to screenshot it, it disappears. Any time I swipe the notification panel down, it disappears. Basically, it shows up when i do something and if i try to engage it, it leaves. Location and GPS are off and it doesn't show up in any android lists for icons or notification bar icons. Does anyone know what it is?