I have the same freezing issue the user posted the video of on his 7, only mine is with the iPad Pro 12.9 v2. It started freezing somewhere in beta of iOS11 and has never gone away, I tried fresh re-install etc., same problem. I am now on 11.1 and the freezing still occurs for those wondering. I don't have any problems on my iPhone 8 Plus. Must be something in the configuration profile or OS core, it's highly annoying at minimum.
I am happy to say this freezing on my iPad Pro appears to be resolved in iOS 11.1 beta 4!
Update: the problem returned a day later.
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