Yes i noticed today that my PR wen t form 2 to 3. But i was expecting 5... jejeje i had worked very hard on quality backlinks. I dont know what happens.
The only thing I can recommend to those dropping on ranking is to check their own links. If they are getting links from bad neigborhoods, that means that Google has penalised you...Or it is just that your competitor is doing it better than you. Anyway carry on getting links to consolidate your position.