Methinks the whole “malfunction” thing is just a BS excuse to not pay up.
A legit malfunction voids the payout...but how does one prove it did or did not “malfunction?”
A malfunction is probably simply a malfunction in the casino’s bank account and their desire to part with the cash.
A machine with a maximum $2500 jackpot hitting for $1 million is about as obvious a malfunction as you can get.