Hello cartapo,
Please check Screen flickers - Laptops / CoreBook X - CHUWI | Official Forum
Your problem may be a variation of the one presented in this topic. I would say to you try revert Video driver to a previous version. If issue still persists, contact CHUWI Support directly “service@chuwi.com”.
I would say to have already prepared some video showing the issue for them. This may help to have support quickier.
Regards