I recently had one of my main keywords drop from #1 to the mid 20's. This site is very strong in this niche and has many keywords ranking at #1 with dozens in the top 3. This seems to be the only keyword that dropped like this. There has been little to no movement with any of the other keywords. The page has not had any link building done recently or lost any links, no content change, or anything else that I would see causing this. The page has been in the top 5 for over a year, in the top 3 for 6 months and #1 for almost 2 months. This major change in ranking seems like it could be algorithmic but the rest of the site is totally unaffected. Any ideas? I plan to ride it out a while to see if returns but just seems odd.