Josuah - 2:42 pm on Feb 6, 2012 (gmt 0)
Is it perhaps the title now is way too general? For example if previously was Blue Widgets and now it's just Widgets it will cause a problem. See if you can add relevant keywords to rectify the problem, use the meta-title for this.
The change was something like from "blue widgets for sale" to "blue widgets", so maybe you are right.
the problem seems to happen when you remove a keyword that the page previously ranked for. It would seem that Google 'resets' the page as if brand new when keywords go missing
That's an interesting thought.
Thanks all for sharing your experience!