Planet13 - 9:20 pm on Jul 15, 2011 (gmt 0)
...on sites that had not been touched in any way for over a year, up to 6 years in one case. They were getting steady predictable traffic and immediately following minor changes the traffic plummeted.
could it just be that since google hasn't seen new content / changes in 6 years, it needs to reassess the page when there is a change (to make sure the page hasn't been hacked, or something else along those lines).
Have you seen ANY recover in traffic / rankings for those pages? If so, what was the time line?
And what was the backlink profile for those sites like?