I failed an audit in the suggested edits queue today. No excuses on my part, it was (in hindsight) an obviously invalid edit and I wasn't paying proper attention.
However, what I found odd is that I got review banned for two days, with the usual message "You have failed too many recent review audits – looks like you might need a break. Come back in 2 days to continue reviewing."
As far as I can remember I've only ever failed three or four audits ever, and definitely not more than this one for at least the past few days.
Given that I failed one audit recently, all while passing a great number of audits, a review ban for 2 days for one failure strikes me as unreasonable.
EDIT: Thanks Brad for looking into it - it seems the number of failed audits I've had in the past month is two (including this one). Seems somewhat extreme to me but understandable.
Now what I wonder is if there's any way for a certain number of passed audits in a row to cancel out a failed audit? It seems to me that that might help prevent situations where the occasional missed audit punishes a generally good reviewer (not necessarily me).