Google was indexing 1,400,000 of my pages. For the last 15 days, the number of indexed pages drops each day by 5,000 to 10,000. I have not seen any warnings or notices in Google webmaster tools.
I am using this tag on each of my pages:
<link rel="canonical" href="http://www.example.com" />
Is this what is causing the problem? I'm scared that Google will remove all my pages from their index.