Same here,
Dell XPS 8940, Intel I7-11700 @2.5GHZ, 32GB Corsair RAM, GeForce RTX 3060, Samsung 980PRO SSD. Windows 11 Pro.
Clean windows install, full reformat C, every hardware and BIOS driver updated manually, from manufacturer, and with 3d party app.
Running clean stock, or with daily driver software, having random freezing. could be 5 min, could be 5 hours. Gaming, or system at rest. No error logs surrounding the events!! Very frustrating.
Multiple memory tests, 6 of them back to back, all drive diagnostics are clean.
Reseated hardware, uninstalled and reinstalled every driver for each component with previous and current versions multiple times.
I'm losing my mind on this.