Not really. I have seen that when I optimize or change elements of a page that are big SEO elements (Title,Htag,Content) Google usually goes through a fluctuation but then returns or improves upon my position. That is of course unless you "de-optimized" your pages for that term. Like pulling it out of strong SEO positions.
I would start to think about making changes if no improvements come after about 3-4 weeks depending on your crawl rate.
You might also want to check on some of the link building you have done to the page. Some of those links you built may be devaluing your page. Make sure you have a healthy backlink profile going to that page.