This little treat appeared on my lock screen this morning. It seems to be intermittent, only replacing the real lock screen about one in three times. Has anyone else seen it?
It is probably and App launcher or user installed file manager. If you use something like ES explorer, buying pro version will probably fix it. Check if the ads go away by disabling any "feature" app.
Ok.. lemme guess.. you have a Samsung device. Right?
It's not an app.. IT'S SAMSUNG!!
Go to settings --> Advanced --> Quick Charging and then turn it off or something..
Hope it helps!