A grey stripe has appeared right above the nav bar This morning after some regular use a grey stripe suddenly appeared right above the nav bar. The stripe follows the nav bar, so if I collapse the nav bar the stripe is moved down to the lower edge of the screen. Se attached images:






It's semi transparent and a nuisance... 

The device is a Samsung Galaxy S8 Plus
I found out what the problem was.

As a side note I work as a designer for a company with a dedicated Android app. The current builds from the development team are pushed to my device where I can test the builds and provide input.

In the latest builds from today the team had integrated a third party lib which produced a on-screen server communications log. This log appeared as a grey stripe wherever I was in the device without me knowing, and only started printing logs when I started the beta app.

So, no problem with Samsung on this one, I guess this is a problem no one else ever will encounter. :)