The screen of the Samsung Galaxy Tab S 4G tablet goes out?

Question

samsung galaxy

Hello.
In general, the problem is as follows - they loaded the Samsung Galaxy S tablet with 4G. You turn it on, everything works, after a few minutes it's always different, the screen goes blank, well, as if you're not doing anything. When you put it strictly vertically or put it on the table, this does not happen.
I was told that there is a type of sensor, when you do not look at the tablet, it goes out, but I turned it off for me.
What are the options for solving the problem, except for a hard reset? Maybe I'm doing something wrong in the settings.
Thank you.