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Bulletstorm & XCOM:TheBureau Audio problems, need help!

Level 9
Bulletstorm (original) and XCOM: The Bureau both show the same audio-related problems:

1) Voices in any cutscene become increasingly desynced with the voice lip animations, so you can see the character speaking well after the voice clip has concluded.

2) Longer cutscenes tend to periodically lose audio entirely for the duration of the cutscene, so the audio turns on and off every 4 or 5 seconds.

3) Normal gameplay is unaffected.

Google searches do not show these same problems reported elsewhere. Both these titles are Unreal 3 engine games. My system is:
Crosshair Hero VI (Realtek audio chipset)
Radeon Vega 64 (latest 18.4.1 drivers)
Freesync 2 monitor, with Freesync enabled on card & monitor (120Hz Refresh Rate)
Win10, and I've tried both the Realtek audio drivers, & Microsoft HD audio drivers