zehrila - 3:58 pm on Aug 23, 2012 (gmt 0)
Even if you believe your site is Quality and had been a success throughout or has an impeccable record, i am afraid to say Google at same time is not the same old. They are changing their perception of good content, they are in for the money and they are your competitor. They are going to become Yahoo answers and answer to every thing where they see they can help users.
I recommend, take a look at ground realities and change, shift your website according to new trends. If there are thin or shallow page which are not adding up value, it might be a good idea to noindex them, check for internal issues, such as site structure, duplicate urls, how many supplimental pages are auto created by cms etc, how many ads are above the fold, navigation and all that.
Change is the only thing which is permanent, if you refuse to change and adopt to new strategies, it will get harder.