I own a Chuwi Hi12 yet face the same problems. My solution was to turn off the corresponding keys (Win-D, etc.) completely. To do so I use AutoHotkey (https://autohotkey.com/) with the following script:
#D::
Return
#Tab::
Return
#A::
Return
#B::
Return
#Down::
Return
#Up::
Return
Maybe this works for you as well.
