@Sebastian Heit hey, you might not be aware but you followed too many people. This affects replication and some people are blocking you to avoid fetching all of that data.
The way SSB social graph works is that you usually follow those who friends with and that gets you a subjective view of the network. At some point, you might not even need to follow some people you're friends with because they're friends with your friends and their content will be fetch anyway.
I suspect this will lead to a cascade of blockage of your profile as people scramble to avoid fetching all data from you. I'd advise you to unfollow those 17k accounts and focus on a sensible number of people you're more interested in interacting. If you don't do that, you'll probably end up being blocked by so many people that you'll be isolated inside SSB.