Basically, I'm running latest developer beta, but beginning with the previous version, I've been unable to get updates, new apps, Apple Books, movies, anything Apple related, including iCloud files.
Kindle downloads fine. My certificate is current, I've tried multiple networks, and my iPhone on the same network handles it fine. Usually I get the first pip of a download, then it freezes.
I've wiped and reloaded/reset the device, restoring from a backup, and for a few minutes it worked, then it stopped again. I've checked time zone settings, made sure time and date, location are correct, logged in and out of iTunes, re-downloaded the developer certificate.
Basically, I'm stuck. I am now not even sure that rolling back to iOS 11 would solve the problem, and I really don't want to do that anyway. Has anyone experienced this, or know of a solid fix?