Google Webmaster Tools

Hi,

At least once a week when I go into my Google webmaster tools to look at some of my site stats I get a message saying:
"No pages from your site are currently included in Google's index. Indexing can take time. You may find it helpful to review our information for webmasters and webmaster guidelines"
Around this time my positioning in the SERPS seems to be adversely affected too, sometimes high ranking pages completely disapearing.
Does anyone else experience this or know why it's happening? The next daythings are usually fine again but I certainly experience some time each week where this happens, possibly affecting my search traffic.
Any ideas/suggestions would be greatly appreciated.
Thanks

Macfras

Unique content and Tags on every pages of site will help to prevent supplementals. But if you encountered loosing if indexed page this is natural now adays. G is on mode of ups and down.