I had a site which had been sitting in position 3 for it's main keyphrase for the last week or so. Previously it had been around the lower ends of page 1. However upon checking today my site has all of a sudden dropped to number 38!
The strange thing is I haven't done anything different to the backlinking efforts and the content remains the same. I'm wondering if this is a temporary thing or if there is no way of possibly knowing at the moment?