Occasional freezes/stalls on new PC.

Built a new PC about a month ago and I’ve been getting weird intermittent freezes/stalls that I cannot pin down.

Usually happens during light tasks like YouTube, Reddit, scrolling, etc.
Games are completely fine
Mouse often still moves during freezes
ONE time the whole desktop/taskbar/explorer freaked out and restarted itself, but that only happened once
After one freeze I heard 3 clean sinewave boops through audio (the sine was around, but maybe not exactly, 440Hz?)
No BSODs
No graphical artifacts
Not getting progressively worse, just randomly happens from minutes apart to days apart, it fluctuates

Important details:
it started relatively recently
I previously had a game crash caused by unstable GPU OC/drivers freaking out (I already removed the OC and did a "Clean Install" of GPU drivers through the NVIDIA app)
Hardware acceleration in Opera GX is off already (I know Opera GX is garbage anyway, don't flame me)
Temps are fine. no spikes
Usage is fine during freezes (no CPU/GPU/RAM/Disk spikes in Task Manager)
SSD health is 100% good in CrystalDiskInfo
SFC /scannow found no integrity violations
DISM completed successfully
Windows fully updated
Minimal background apps running

Things i already tried:
"Clean Installation" of GPU drivers through the NVIDIA app
SFC + DISM
Monitoring task manager during freezes
Disabling browser hardware acceleration

Specs:
MSI RTX 4060Ti 16g OC
i5-12600k
32GB dual channel DDR5 (6000mt/s, CL40)

Has anyone had similar freezes specifically during YouTube/Reddit/light desktop use with no actual resource spikes or overheating? Sorry for the massive unreadable brick of text