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Generally, you’re on a Beta, so there’s that.

Additionally, I was having network issues on my iPad Pro, so I reset my network settings and IMMEDIATELY noticed an improvement. YMMV.
 
The only problem I have had was today at the docs office. iOS 11 would not allow me to connect to their public wifi. Got a message that I could not connect to an unsecured network. Same result on both 6s and iPad Pro 9.7.

Home and work are both 5G and I have no problem.
 
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