Ever since around August 20th, i've started to see a huge amount of seemingly random 404 errors creep into my site's error count in Google Webmaster Tools. It says that they originate from articles that have been posted, but I can't verify this in any way (physically looking at source code, nor "fetching" via Google).
Here are a sampling of some example URLs:
To me, they look like UNIX time strings... but I can't for the life of me figure out where they are coming from.
Has anyone run into this issue?