GoogleBot Changing his Behavior

Hi Buddies
Im in big problem. Plz help me.

Last time Google Visited on 30th jan on my site and my problem began that day only.

Bfore that i was having 170 pages of my site were indexed with full title and description but after last GoogleBot visit all the titles and description are removed and only URL and similar pages link appears when i search for my indexed pages and also i hv lost all my ranks.

And all the description and titles remains intact at yahoo and others

Can ne body explain what the problem is and what can be the solution.
Has Google changed his algo or smthng like that.

Looking for a response which can help me.

Any chance those pages look like duplicate content to Google? That's the usual reason for this happening.

thanks buddy

bingo u got the weak point of my site.
now i tell u some more about my site

I WAS HAVING SOME DUPLICATE CONTENT PAGES IN IT.im using about 70 doorway pages in both of my sitea and both of the sites are indexed in the late jan.but these pages were present long bfore and there was no change recently.
now one of my site got that problem and the other one is still doin fine.
if the problem can be bcoz of this almost duplicate content ,then both of sites should hv banned so plz help me its falling heavily on me.

Can't help you. You have to help yourself on this one. Get rid of your current strategy and move to a clean, non-duplicate strategy, or you may one day wake up to see the same problem with the other site.