I had this same issue with the AppHangB1 error. I had to completely uninstall the graphics driver using DDU and reinstall them. This has worked for myself and a few others apparently, here is the thread if you want to read into our experience with the issue: Extreme freezing and performance issues in Sepulcher - #25 by Lifehymn-thrall
I’ll add that the other player having the same issue that commented in that post with the DxDiag output was also using a GeForce GTX 1070 card.