This fixed it for me! thanks @Megabite and @Harrowheark for posting. It was driving me nuts! lol 
BeQuiet was doing it for me
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Still happening to me in Halls and COS specifically
(edit to clarify: I dont have any addons or settings impacting audio/talking heads like some others, nor did I have the issue prior to 10.0.7. Those might just increase the frequency of the bug)
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Thanks, I found this and made these changes.
I hope this fixes it. def had these settings enabled and wasnt aware.
I think it’s because the addon disables the audio when loading the game, so exiting and opening the game again fixes it and should work from hereon out.
That was my problem, WQT had those options enabled, weird option for that kind of addon though lol
I would like to add that this is still happening in TWW over a year later. It occurred for me during the quest where you have to summon new stormrooks for the Stormriders. That cutscene did not have dialogue, and then afterwards there was no dialogue for any NPCs at all.
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I’ve had the same issue with many of the in-game cutscenes.
Had the same issue here with he summoning of the stormrooks quest in TWW campaign. Disable addons and relog did not help. Full restart of the game is the only thing that fixed it. I hope it doesn’t come back as others have reported.