Smart stay slowing down my mobile

Hi everyone. My galaxy s5 is blocked by the process which looks like smart stay. When I'm writing text, browsing websites or just simply want to switch between apps the eye icon of the smart stay appears and I can't do it easy. I need to wait until this process will stop. Some times it is even 10 or more seconds for each letter. Smart stay is off in my mobile. I'm not using it. It looks like virus or some error after uninstaled app. If you have any idea how to deal with it please write.
Regards.
Marcin.

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