I too have had this issue! No lights, sound and action
But I solved my problem :=) on my own because I'm Mister Wonderful :>
I reinstalled the quiet hours tile.
Then I went into quiet hours setting and changed hours from 00:00 & 00:00 to 01:00 & 07:00. The latter being outside the current time of day I was working in.
Then I went back to the quiet hours tile and turned it off. Holy Smokes this time it actually worked.
Because the power charger was connected the notification lamp began to burn green again. SMS notification sounds were heard. Even "You got mail" wasn't afairid to stand up to be heard.
Another wonderul day in paradise!