Hey there! It's me you're talking about (probably among others)... I didn't actually revert back to 11.2.5 anyway. I found a fix. And I'm actually a bit sad I did, because Apple just contacted me about getting extra information for them to fix the bug, and I can't get it to them, because my solution was not just to reset network settings, but the entire iPad, and restore it to an iCloud backup (still on 11.3).
Would you be interested in helping Apple out with this bug? PM me your email address and I'll redirect Apple's engineering team to you, saying you still have the issue and you can gather the diagnostics information they want
PS. An alternative to using a not secure connection, is to plug the iPad into a Mac and enable internet sharing over USB (that's how I reset my device, since iTunes also didn't work for managing it, and resetting requires internet access to confer with my AppleID)