It completely depends on the links you have developed thus far, and your internal site structure. This is the time to check for the quality of your links and your site architecture.
When did this happen exactly? Maybe a PR update is in progress If this is the case then the site should receive its PR in couple of days. However I have seen cases when the PR dropped and returned to normal only at another PR update. And PR updates are very rare nowadays.
if you have tons of links then check them properly. how many of them are still active. if it is o then a page rank update is going on. i faced this before. my site PR2 got zero after 3/4 days it got 3
You need to check the quality of the links wich are pointing to you. Maybe a one time promotion was done before?
You might had PR 5 because of website age, now you need to get quality backlinks and try to for classified ad pasting, that will give you instant traffic and ranking.
I do not think so Page rank can effect your Search ranking, I will suggest concentrate on making Quality back links from high Page Rank Websites.
Just check out your all backlinks and try to improve the factors that you had used for ranking. Start your optimization again and try to keep a good balance in all the strategies in SEO. Good Luck!
1.) Some of your backlinks might be banned; in this case you have lost your PR 2.) It's Google Dance and your PR will be back in some days (already happened to me) 3.) It's Google Dance but you will get back your PR only at the next PR update (it also happened to me, PR4 to PR0, then now 5 months later it is back to PR4). Hope my thoughts help, Cheers
Go first for checking your backlinks. Some times something like this happens due to ban of backlinks. If they are OK, then do not worry. You should already hared that it happens randomly. Wait and see. Hope you will get better PR soon.
The updated pagerank ~ 2 weeks ago on all 15 of my ranked sites so I would say in some capasity, "yes"
wht i've heard is tht PR 2,4,6 are bad cz these figures most likely increase or decrease when PR is updated in short they are not stable.
Sometimes there are big problem to search google PR. So i think your site can not use anyone that's why PR is goes to down.
maybe links we're reduces or your site lost reputation, I also running a blog that lost it's PR from PR 3 and it didn't gain any PR but 0.
check any BL you have.. couse in every update, domain BL is also updated. dont worry, check again for next update.