Touch Screen is posessed

My Chuwi tablet is not working properly. It works when it wants to. When it is acting up, for example, the number pad works without me touching the screen. Other than that, it will work fine for a short time, then not at all. Is it worthwhile to replace the screen (or a board, etc)? Thanks for your help.

Can you tell which is your tablet?

Thank you for your kindness. It’s a Chuwi Hi9.