Random freezes: struggling to diagnose

Hi, I'm running Ubuntu MATE 19.10 fully updated and with the Nvidia 435 drivers and I'm getting random freezes, usually (but not always) when I'm streaming with OBS. I've replace my Nvidia graphics card and the problem still persists.

My lspci

My journalctl in the run up to the freeze.

The system froze, followed by a hard reboot, with no intervention from myself.

Here's the journalctl in the run up to the issue: