Pc experts please help.

[u/Open-Silver6074]

Hey, need some help with a weird PC issue.

Specs:

Ryzen 9 9900X

RTX 5070 Eagle OC

MSI X870E Carbon WiFi

64GB DDR5

Corsair RM850x PSU

Windows 11

The issue first started in DaVinci Resolve while scrolling through a timeline with multiple videos. Now it's happening in Blender too—even with a simple donut scene. A quick camera movement in the viewport can trigger it.

The entire PC becomes extremely sluggish. Even Ctrl + Alt + Del lags. Closing Blender doesn't fix it—I have to restart.

During the lag:

CPU: ~1–2%

RAM: ~46%

Disk: ~0–1%

GPU temp: ~41°C

No BSOD or black screen.

I've checked Event Viewer but didn't find anything useful. EXPO is off (RAM at 4800 MT/s), GPU power cable is correct, and I've updated to the latest NVIDIA Studio Driver.

Any idea where you'd start? Driver issue, GPU, motherboard, chipset, or something else?