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.
Is a canonical tag pointing to my home page causing Google to remove my pages from the search index?
google;index