I may also have the same, or related issue.

OS: Kubuntu 20.04 LTS
CPU: Intel Core i9-9900K
GPU: GeForce RTX 2080 SUPER
Driver: Nvidia proprietary driver 460.32.03
Linux Kernel: 5.4.0-65-generic

What happened?
Was watching a movie on Plex, using the web player in the Brave browser (List 
as Version 1.19.88 Chromium: 88.0.4324.96 (Official Build) (64-bit)), when the 
system froze. I could hear sound for several seconds in the background, then it 
just stopped completely.

What was expected?
Should've continued playing the video.

Log:
NVRM: Xid (PCI:0000:01:00): 31, pid=278, Ch 00000002, intr 00000000. MMU Fault: 
ENGINE HOST0 HUBCLIENT_HOST faulted @ 0x10_00000000. Fault is of type FAULT_PDE 
ACCESS_TYPE_VIRT_READ
NVRM: Xid (PCI:0000:01:00): 31, pid=5096, Ch 00000050, intr 00000000. MMU 
Fault: ENGINE HOST0 HUBCLIENT_HOST faulted @ 0x21_02b07000. Fault is of type 
FAULT_PDE ACCESS_TYPE_VIRT_READ

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https://bugs.launchpad.net/bugs/1852002

Title:
  Desktop frozen for 30 seconds after Nvidia driver crash

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