Hi! Once in a while my PC completely freezes when joining session or sometimes when someone jins my session. Have latest drivers, checked the hdd etc etc (checked steps from https://support.fatshark.se/hc/en-us/articles/360038965013--PC-How-to-Resolve-PC-Crashes-Loss-of-Responsiveness-or-Blue-Screens-BSOD-%209).
Also Darktide is the only game doing that, have Elden Ring, Spiderman and couple of other demanding titles installed. And I have quite a good rig - i9-10980xe, 3080 geforce, 64 gb of ram.
This sounds irrelevant, but do you happen to have an Oculus or other VR headset connected to your PC? Your symptoms are similar to an old issue we had on Vermintide 2. 
No, I don’t have any kind of VR connected or actually ever connected to this PC.