Sick of the crashes, sometimes only a few minutes apart and other times days apart, I moved to KDE/Plasma on a fresh installation. Initially seemed to fix the problem but then it came back. Not exactly the same symptoms, but similar and usually resulting in the whole desktop freezing.
So, I thought must be hardware, given that logs just stopped whenever the problem arose. Changed graphics card - no improvement. Changed motherboard - initially seemed to work but then problems recurred. Obviously did all the usual things like removing and reseating anything that was plugged in.
Then, one day while Googling I got a hint that there had been a few issues with the Buster kernel. I do run a fairly stock installation. Added Backports to my sources list and installed the 5.10 kernel on yet another fresh installation.
As you can see from the inxi output below, uptime currently nearly 8 days and no crashes at all, just a couple of occasions when the system seemed to take a few seconds to catch up.
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chris@MDD10KDE2:~$ inxi -F
System: Host: MDD10KDE2 Kernel: 5.10.0-0.bpo.3-amd64 x86_64 bits: 64 Desktop: KDE Plasma 5.14.5
Distro: Debian GNU/Linux 10 (buster)
Machine: Type: Desktop System: Gigabyte product: N/A v: N/A serial: <root required>
Mobo: Gigabyte model: 970A-D3P v: x.x serial: <root required> UEFI: American Megatrends v: FB date: 10/28/2014
CPU: Topology: 8-Core model: AMD FX-8350 bits: 64 type: MCP L2 cache: 2048 KiB
Speed: 1405 MHz min/max: 1400/4000 MHz Core speeds (MHz): 1: 1406 2: 1429 3: 1401 4: 1404 5: 1405 6: 1403 7: 1406
8: 1400
Graphics: Device-1: NVIDIA GK208 [GeForce GT 710B] driver: nvidia v: 390.141
Display: x11 server: X.Org 1.20.4 driver: nvidia unloaded: fbdev,modesetting,nouveau,vesa
resolution: 1920x1200~60Hz, 1920x1200~60Hz
OpenGL: renderer: GeForce GT 710/PCIe/SSE2 v: 4.6.0 NVIDIA 390.141
Audio: Device-1: Advanced Micro Devices [AMD/ATI] SBx00 Azalia driver: snd_hda_intel
Device-2: NVIDIA GK208 HDMI/DP Audio driver: snd_hda_intel
Sound Server: ALSA v: k5.10.0-0.bpo.3-amd64
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169
IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: fc:aa:14:c1:43:1c
Drives: Local Storage: total: 2.95 TiB used: 907.32 GiB (30.1%)
ID-1: /dev/sda vendor: Transcend model: TS240GSSD220S size: 223.57 GiB
ID-2: /dev/sdb vendor: Samsung model: SSD 860 EVO 1TB size: 931.51 GiB
ID-3: /dev/sdc vendor: Seagate model: ST1000DM003-1ER162 size: 931.51 GiB
ID-4: /dev/sdd vendor: Seagate model: ST1000DM003-1ER162 size: 931.51 GiB
Partition: ID-1: / size: 19.56 GiB used: 18.29 GiB (93.5%) fs: ext4 dev: /dev/sda6
ID-2: /home size: 39.12 GiB used: 2.51 GiB (6.4%) fs: ext4 dev: /dev/sda7
ID-3: swap-1 size: 17.00 GiB used: 1.18 GiB (7.0%) fs: swap dev: /dev/sda8
Sensors: System Temperatures: cpu: 15.8 C mobo: N/A gpu: nvidia temp: 62 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 52%
Info: Processes: 293 Uptime: 7d 20h 54m Memory: 11.66 GiB used: 2.51 GiB (21.5%) Shell: bash inxi: 3.0.32
Now to working out why my network speed is only 100Mbps, why I'm missing 4GB RAM and why I can't get sensible temperature and fan readings.
Debian. It's a work in progress.