Windows 11 PC desktop lagging randomly (Ryzen 7600)

Ever since i upgraded CPU (April 2025, i7 7700k to Ryzen 7600 with fresh Windows 11 install), PC randomly lagging on desktop (im talking about clicks taking 5 seconds to register, everything loads slow, PC becomes unusable until reboot, but the cursor moves fine) after closing videogames or when opening many Chrome tabs in a short time (happened once - because of it i switched to Firefox entirely, thought it fixed itself because i haven't gotten any issues until today, after closing Battlefield 6).

The lag can only be fixed with a system reboot (but one time it fixed itself without rebooting, after Ending Task on explorer.exe and restarting it manually, or restarting graphics driver with Win+Ctrl+Shift+B, but i haven't managed to reproduce the fix again, having no other option but to reboot PC).

It never happened while playing videogames.

I keep MSI Afterburner hardware monitor graphs on my second screen, noticed CPU usage randomly spiked to 100% and then hanging between 50-100%, but when opening Task Manager (Processes/Performance) it only shows 10% CPU usage max, so it has to be some hidden process.

Apps on background/system tray: Firefox with about 10 tabs on second screen, 10-20 tabs on main screen, Steam, MSI Afterburner, Rivatuner, uTorrent, Nvidia App, Razer Synapse 3 (enables mouse charging dock to display battery level lighting). No antivirus other than default Windows Security.

SPECS:

Ryzen 7600 (PBO and ReBAR on) with Noctua NH-D15

Asus TUF B650 mobo (bios updated)

32GB (2x16) DDR5 6000MHz CL30

Samsung 850 EVO 250GB SSD as boot drive

Samsung 860 1TB SSD

Seagate 2TB HDD

RTX 3070

Seasonic Focus GX 850

Any ideas? Anyone with similar issue?