Question PC Audio and Video stuttering every 30-40 mins for about a second

[AWindowsUser]

Hello.

Since late 2019, I noticed that my audio and video stutters for about a second every 30-40 mins. This can happen in games, while watching videos, or just doing anything. My PC wasn't good at that time so I wasn't really paying attention to it because I experienced FPS drops regularly and the performance wasn't good.
In December 2019, I upgraded my PC completely (I only kept my SSHD and GPU) and the problem still occurred after the upgrade.

Specs:
CPU: Ryzen 5 3600
Mo;herboard: MSI B450 TOMAHAWK MAX
Ram: RAM DDR4 16GB Kit (2x 8) PC4-25600 3200MT/s CL16 SR x8 1.35V Crucial BX Sport LT
SSD/HDD: SSD 250GB 2.5" SATA3 3D TLC, 7mm, CRUCIAL MX500 and a SSHD
GPU: Nvidia (Asus) 1060 GTX 6 Gb
PSU: BE QUIET! STRAIGHT POWER 11 550W (BN281) 80Plus Gold modular ATX
OS: Windows 10

A month or 2 ago, I had a problem that PC would stutter every second (like having 1 FPS). If I wanted to restart it I would have to hold the power button for 5 seconds because it was staying at "Restarting" screen forever. I disabled fast boot and the problem didn't occur (1 sec slutters every 30-40 mins still occur).

Today, when I was updating Realtek PCI-E Ethernet Drivers , the problem above (stuttering every second) started happening again. I tried to restart my PC, but in the end, I still performed hard shut down (holding the power button for 5s).

Is there anything I could do to fix this issue?

 

[AWindowsUser]

LatencyMon report

First 20 mins, results were normal. After I returned after an hour, this were results. I'm guessing that the audio/video stutter happened in the meantime

Is that the problem? What should if fix?

 

[AWindowsUser]

LatencyMon report

First 20 mins, results were normal. After I returned after an hour, this were results. I'm guessing that the audio/video slutter happened in the meantime

Is that the problem? What should if fix?

Does that mean it's likely a software issue, not a hardware one?