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Automated statistical sampling, maybe?
Has there been a Panda refresh lately?
[edited by: Robert_Charlton at 10:54 pm (utc) on Mar 3, 2013]
...because once Gwmt reaches about 50 errors the traffic drops off but the errors continue unless I remember to go into Gwmt to remove them. But soon as I remove them the traffic picks up within a week.
Whenever the 404 errors in Google Webmaster Tools get to a certain point (about 50), which are all due to typos --because I don't have any broken links, then my traffic drops off until I remove the errors then it picks right up again.
Not that I know of.