“The Hart eSlate machines are not malfunctioning, the problems being reported are a result of user error — usually voters hitting a button or using the selection wheel before the screen is finished rendering"

More like a page loading issue. Probably need to look at optimizing the page or display a simple big "LOADING..." in the middle of the screen while all fields and field values are being loaded. Also disable the actual page (all submit or selection buttons) while page is being loaded.

Definitely not user error. Different locations have different internet connection speed that will effect page loading.