The permanent fix is to not allow the POS screen to minimize. Ctrl + F6 | Window button | uncheck Show re-sizable border.
Another work around is to lock the registry settings for the screen needed so they cannot be changed. Essentially, its doing the same as above
Finally, one can export the Registry settings for the screen settings, save it to the desktop and whenever the screen is minimized, right click the exported setting and import it. The logged in user will have to have Admin rights to make the change.