Lost more than 100k likes since March 2015

For more than a year my likes are dropping everyday since March 2015 when Facebook started removing fake likes. In the beginning it started with some huge drops and since then it's dropping in the same amount of likes everyday. I have more than 2 million fans and I never bought any likes, my page likes are all legitimate and were gained by hard work. Anytime I contacted Facebook they said that it's because they're removing fake likes. I simply don't believe it and I find it as an excuse they are telling to everyone.
See image: http://i.imgur.com/kQoHEIS.png

Did anyone here experience the same thing? Did anyone have any idea what's going on here and where these unlikes are coming from?
It's impossible to see these unlikes source in page insights.

* P.s: The unlikes are 100% not related to the content I share on my page.

I had the same problem a couple of months ago. They are also removing likes from inactive accounts as far as I know.

Guess there's not much you can do, in the end of the day your FB page belongs to Facebook from the moment you accepted their TOS and they can and will do whatever they want with it.