Basically there was something about how they flagged your account when they detected you using something 3rd partyish....obviously the more you play and the more you used it the more chances to be flagged more often. If you just used it once or twice randomly the chance is smaller (not zero but Im sure much smaller) than someone using MH and bots all day every day.
It has to do when with they updated the Warden scan list. I guess you could have just gotten lucky, but it scans every 2-4 seconds so I doubt you get lucky for long.