Fedora 33 freezes frequently and randomly while watching video (FireFox and Chrome). Small sound sequence loops endlessly. All input / output devices are blocked, no mouse (laser off), no keyboard (caps lock LED does not work). The only thing that helps is hard reboot. No error reporting after the hard reboot.
My machine is Dell 3640, intel 10700k. Comet Lake PCH-H W480 chipset. No discrete graphics card.