I was in talks with apple's twitter support channel. They adviced me to first do a factory install, and not recall a backup. And see if it helps. From there they could try to help me pinpoint the bug..
But this machine is brand new and the issue was present when it came with factory install.
Anyhow, that's what they're telling me to do.
I can't do that right now because I have a **** internet connection. I need to get work done while I'm travelling.
Anyhow, Apple, this is serious. I got this mostly for music, and now I can't really use it professionally for music. The "Apple silence" really bugs me at times like this. Perhaps you're just silently working on a bug fix for iOS 11, and you're well aware of the bug, and that's fine. But it'd be great if you told us.