Which is a problem, of course. I'd be more inclined to worry about illegal votes from people who shouldn't be allowed.
Like felons. Or the dead.
After we tighten the screws on outright voting fraud, then I'll worry more about garden variety incompetence from equipment manufacturers.
"After following the links and reading the actual complaints, I'm not really seeing any allegations that add up to anything more than incompetence."
Nonetheless, I think it would be good if voting machines were manufactured via an "open" model---i.e.--all hardware and software made public.
This would raise the price since the manufacturer would not lose competitive advantage over any features included in the machines. But it would be worth it.
Trust in the electoral process is central (even though the Dems do systematically cheat.)