I think I have found the cause, although it seems a little odd.

Yesterday the system ended up in the "powered down" state shortly after boot. I 
may have booted the wrong kernel.
Anyway I rebooted to the 6.8.0-48-generic kernel and all was OK. 
Until my daily backup reported that it couldn't find the backup partition. 
Which was odd, as it is on the internal SSD (the NUC has an M2 NVMe and an SDD).

So I shut down and removed the SSD to check it on another system in a
USB caddy (it was fine) then put it back into the NUC.

Now it was found again. Presumably there had been a dodgy connexion (the ribbon 
cable connexion to the motherboard?).
So I wondered whether this had been the problem all along and tried booting 
6.11.0-13-generic. This now seemed to be OK.
It's still OK today. I'm using it now.

So I'll close this.

An odd bug though to have only affected 6.9+ kernels, when 6.8, and MS
Windows was OK.  (And btrfs scrub *before* I reset the connexion
consistently ran at 445MiB/s).

** Changed in: linux (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2087333

Title:
  kernel 6.11.0-9-generic stops on Intel i3-1315U NUC

Status in linux package in Ubuntu:
  Invalid

Bug description:
  I've just upgrade to Kubuntu 24.10 on 6 systems.

  The last of these is a Intel NUC with a "13th Gen Intel(R) Core(TM)
  i3-1315U" processor.

  This system does not stay up very long with the 6.11.0-9-generic
  kernel. After a minute or so the system stops, the display goes blank
  and the power button on the system goes out.  I have to recycle the
  power on the wall socket to get things back to life.

  If I boot into the 6.8.0-48-generic (from 24.04) the system runs OK.

  Similarly, the other 5 system I have installed 24.10 on:
     NUC with i3-1115G4 processor
     NUC with i3-10110U processor
     NUC with i3-8109U processor
     laptop with Ultra 5 125H processor
     laptop with i5-10210U processor

  are all OK running 6.11.0-9-generic

  
  NOTE: that any kernel details in the attached report are for the 
6.8.0-48-generic kernel, noit the failing one!!!

  ProblemType: Bug
  DistroRelease: Ubuntu 24.10
  Package: linux-image-6.11.0-9-generic 6.11.0-9.9
  ProcVersionSignature: Ubuntu 6.8.0-48.48-generic 6.8.12
  Uname: Linux 6.8.0-48-generic x86_64
  ApportVersion: 2.30.0-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/seq:        gml4410    2488 F.... pipewire
   /dev/snd/controlC0:  gml4410    2490 F.... wireplumber
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Thu Nov  7 22:59:23 2024
  InstallationDate: Installed on 2024-05-15 (176 days ago)
  InstallationMedia: Kubuntu 24.04 LTS "Noble Numbat" - Release amd64 
(20240425.1)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: Intel(R) Client Systems NUC13ANHi3
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-48-generic 
root=UUID=1dc99963-d570-44ff-a00b-09df908f9dd2 ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-6.8.0-48-generic N/A
   linux-backports-modules-6.8.0-48-generic  N/A
   linux-firmware                            20240913.gita34e7a5f-0ubuntu2
  SourcePackage: linux
  UpgradeStatus: Upgraded to oracular on 2024-11-07 (0 days ago)
  dmi.bios.date: 07/16/2024
  dmi.bios.release: 5.27
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: ANRPL357.0033.2024.0716.1113
  dmi.board.name: NUC13ANBi3
  dmi.board.vendor: Intel Corporation
  dmi.board.version: M89896-203
  dmi.chassis.type: 35
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 2.0
  dmi.ec.firmware.release: 10.22
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrANRPL357.0033.2024.0716.1113:bd07/16/2024:br5.27:efr10.22:svnIntel(R)ClientSystems:pnNUC13ANHi3:pvrM89901-207:rvnIntelCorporation:rnNUC13ANBi3:rvrM89896-203:cvnIntelCorporation:ct35:cvr2.0:skuNUC13ANHi3000:
  dmi.product.family: AN
  dmi.product.name: NUC13ANHi3
  dmi.product.sku: NUC13ANHi3000
  dmi.product.version: M89901-207
  dmi.sys.vendor: Intel(R) Client Systems

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