mhansen - 5:29 pm on Jun 12, 2013 (gmt 0)
A bit of followup to my previous observation... I noticed today that although we still rank in the top 1-2-3 for the same phrases that have delivered traffic over the last 6 months, those same phrase no longer show up in the auto-complete, or search suggest section when typing.
This leads me to think that along with all these other refreshes that Google have completed since the beginning of the month, they have also refreshed the search-suggest queries, resulting in lower volume of search on those previously-popular terms. (the terms that used to populate auto-suggest)