Richer called the malfunctions "disappointing" and correctly predicted that election deniers and conspiracists such as Trump would "exploit" the issue.
The state's Republican gubernatorial candidate Kari Lake, who has echoed Trump's false claims of a stolen 2020 election, also seized on the machine problems, issuing a "voter alert" on her Twitter account.
Trump, Lake and other election deniers have been calling for the end of electronic voting machines, Election Day-only voting, and the use of just paper ballots and hand counts, a process that is time-consuming, costly and far less accurate than machine counting.
The machine malfunctions fueled distrust among many Republican voters in Arizona that fraud was involved, especially after Trump issued a statement on his Truth Social platform.
"Reports are coming in from Arizona that the Voting Machines are not properly working in predominately Republican/Conservative areas," Trump said, adding: "Here we go again?