Noise from HDMI sound with 470.57.02 driver on Ubuntu 20.04 LTS

Recently, I found that some noise from HDMI sound whenever I play mp3 on any players or youtube on Ubuntu 20.04 LTS.
Normally, I couldn’t feel the noise right after that system boot when I play some music.
However, I can feel the noise about 3~ 5 minutes later after system booted when I play some music.

nvidia-bug-report.log.gz (312.8 KB)

Nvidia driver 470.57.02 (same issue from version 460 as well)
Card : GTX 750 Ti
Ubuntu 20.04.2 LTS

Monitors :
LG Electronics 27GL650F (HDMI-0)

Would you find the attachment and let me know the reason and what I should do for this issue?