As of a few days ago (maybe a week or so) I had about 90% of my Blogger pages indexed in Google. I recently decided to ad a Google Adsense half banner to the end of every post. Since that time I've noticed that Google has slowly been removing my pages from its index...Roughly 10% of the pages/posts per day. Does anyone know if this is normal? Could Google be looking at the ads as a change in content; dropping the old pages before adding the new versions? Any ideas?
Google won't drop your pages if you have adsense. It must be some other reason. Maybe its just different data centers.
Nobody will be able to tell you for sure. Try removing all the things you think may have caused it an see what happens.