tablet Chuwi Hi9 Air digitizer replacement yes or no?

Hello dear members.

Please, I would like your help to a problem with my Android tablet Chuwi Hi9 Air.

Firstly, I would like to help me understand what the problem is. Does it have to do with digitizer (that’s why on problem title “Yes or No”) or the problem is something else?

The problem about 2 months now is that, when I work it horizontally, navigation bar at the bottom does not respond. Three icons (circle, triangle and square) do not respond. Also, if I full screen a YouTube video, if I try go timeline forward or backwards, it does not work, because timeline is in problematic area.

If I rotate tablet on 90, -90 or 180 degrees (on all other three sides of tablet), navigation bar works fine.

Can you help me understand what the problem is and if possible some help and suggestions what to do?

Thank you for your time!