UPDATE: After some more testing, I have found that the audio drop-out issue exists even when playing sound directly through the TV's speakers, thus ruling out the receiver as a culprit. I suspect that the issue has to do with the HDMI port on my GPU and Nvidia's drivers for it.
I have a bizarre issue. First of all, here is my setup:
PC: Custom-built with Intel i7 8700K, Nvidia GTX 1080 Ti, and Windows 10
TV: Samsung Q90T 65" 4K TV
Receiver: Sony STR-DN1080
Speakers: The entire Sony Core Series
Connections: The 1080 Ti is connected over HDMI to HDMI 4 on the TV and the...