Several days ago I found a good domain (already expired) with PR5, and there're 20 or so backlinks (all do follow) to it: one PR 4, four PR 2, two PR 1, all from authority sites with less than 30 OBL on each page. So I immediately grabbed this domain and installed wordpress on it, rebuilt one page literally according to google cache, put a new post on it and wait for google to crawl the site. PR5 only stays with the site for three days, and now it's 0. I've seen lots of people doing this but it seems their sites can always keep the PR. What possibly could I do wrong causing my PR loss? Edited: Does it have something to do with registrar changing / dropping? Well, is it possible that PR went back to 5?