https://krebsonsecurity.com/2018/01/first-jackpotting-attacks-hit-u-s-atms/
“In previous Ploutus.D attacks, the ATM continuously dispensed at a rate of 40 bills every 23 seconds,” the alert continues. Once the dispense cycle starts, the only way to stop it is to press cancel on the keypad. Otherwise, the machine is completely emptied of cash, according to the alert.
I will be absolutely sure to remember this "fix."