Top menubuttons and Bottom left button don't work since 4 days

[Jasperser01]

I hope someone has a solution for this.

When I try to close an app with the bottom left button, it lights up.
After that, nothing.
When I try to display the menus on the top left of the screen also nothing happens.
These problems occurred after I see an extra menubutton which I don't recognize.
I made a picture of it.
Its the 2 rectangles.

Thanks for any advise solving this.
René.

 

[B. Diddy]

Welcome to Android Central! Just to confirm -- you're talking about the 1st generation Galaxy Tab S? If you swipe down the notification panel, do you see any more details about that notification icon?

Does this also happen in Safe Mode? https://www.hardreset.info/devices/...e-mode/how-to-enter-the-safe-mode-in-samsung/