I just discovered today that the 17115 build for me also will not Shutdown. Requires a hard reset to recover and never shuts down. That's in addition now to the won't wake from sleep problem!!!
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I've put it in Feedback Hub after every build starting with 17107. Thanks for letting me know that a clean install didn't fix it either.

C.B.

I've tried that workaround many times in each build since 17107 and it has never worked for me.

C.B.

Not good news for me. Still have sleep wake problem that started with Build 17107 and has persevered since!

C.B.