some of those possibilities are funny. i realized i am also one of your followers and i have not given up on you yet. i also noticed a couple of followers going away but i have seen it in the past. my best guess is that some people are using services that offer auto follow back and maybe there are some services that unfollow if you dont follow them. i have not seen any such service but if its not there yet it will be. i maybe adding that functionality to my own app that i use for steem.