UPDATE: It seems the issue was that pages were accessible via multiple URLs (i.e. with and without trailing slash, with and without .aspx extension). Once this issue was resolved, pages started ranking again. Our website used to rank well for a keyword (top 5), though this was over a year ago now. Since then the page no longer ranks at all, but sub pages of that page rank around 40th-60th. I searched for our site and the term on Google (i.e. 'Keyword site:MySite.com') and increased the number of results to 100, again the page isn't in the results. However when I just search for our site (site:MySite.com) then the page is there, appearing higher up the results than the sub pages. I thought this may be down to keyword stuffing; there were around 20-30 instances of the keyword on the page, however roughly the same quantity of keywords were on each sub pages as well. I've now removed some of the excess keywords from all sections as it was getting in the way of usability as well, but I just wanted some thoughts on whether this is a likely cause or if there is something else I should be worried about.