Public bug reported:

After of about 8 to 12 hours of use the system simply freezes.
No mouse or keyboard response. Even video playing on the page stops responding.
There is nothing special to be done to cause the problem, sometimes the system 
freezes at idle sometimes, sometimes it freezes while I'm using it.

Hardware:
CPU: Ryzen Threadripper 3970x
Memory: 128GB Corsair Vengeance LPX
Motherboard: Asus Zenith Extreme 2
NVMe: SSD Samsung 970 EVO Plus 1TB, M.2 NVMe

System:
Ubuntu 5.4.0-42.46-generic 5.4.44

lsb_release -rd
Description:    Ubuntu 20.04.1 LTS
Release:        20.04

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-42-generic 5.4.0-42.46
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  pcarrara   2332 F.... pulseaudio
 /dev/snd/controlC1:  pcarrara   2332 F.... pulseaudio
 /dev/snd/controlC0:  pcarrara   2332 F.... pulseaudio
 /dev/snd/pcmC0D7p:   pcarrara   2332 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Aug 29 02:07:36 2020
InstallationDate: Installed on 2020-08-27 (1 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: System manufacturer System Product Name
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic 
root=UUID=9e72229e-3b67-433e-94f7-4cb8f323faeb ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-42-generic N/A
 linux-backports-modules-5.4.0-42-generic  N/A
 linux-firmware                            1.187.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/05/2020
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1101
dmi.board.asset.tag: Default string
dmi.board.name: ROG ZENITH II EXTREME
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1101:bd06/05/2020:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGZENITHIIEXTREME:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug focal

** Attachment added: "lspci-vnvn.log"
   
https://bugs.launchpad.net/bugs/1893504/+attachment/5405619/+files/lspci-vnvn.log

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Title:
  System froze

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