Indicates there is some rogue process/app running all the time. You should check and see what app is running. Could be something in iCloud settings (safari sync, photo sync, etc) or email acct hung up causing it. Its not an iOS 11 inherent issue though.
True, not an inherent bug, because to the best of my knowledge this was working in last beta or last to last, so got confused and came to the best place to ask fellow like-minded gentry!
Turns out, I just completely restored it. For some time, it seemed like the issue was not resolved. However, after some hours, it has. On a fresh install, with no software. Now I wil slowly add my software back to find out the specific miscreant.
As of now, going by statistics in the past beta, it is WhatsApp and Hike Messenger. Both have background refresh disabled, both are gone from app switcher, yet both manage to sustain background activity. I didn't even open Hike. I opened WhatsApp 3 days ago. That got me suspicious.
So far, things look better. Joys of a beta, eh!!! Love this every single time ... going with the flow ... new beta, some fixes some regressions ... another beta, new fixes something else regressed ...

It's great to see the interconnections betwixt seemingly disconnected lines of code..
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Do you also think that beta 6 is the worst beta?
So unbelievable much bugs. I would say beta 6 is twice as worse as all ios 11 betas together.
Spot on. I was wondering when would the voice of truth be out.