Thanks, I've setup syslog, so will wait and see what I capture next time.
I'm curious on your performance comment, I'm aware of the potential around overlapping parity writes, for me this is less important than unraid filling a single drive in my multi drive array and then if that fails the whole full drive needs to be re-created. I'd rather a failure state was an equal load on the system rather than russian roulette of it hitting the one or two full disks. Is there anything else you're thinking about?
I had read the ryzen part of the faq, however given this has literally been running flawlessly for almost a year now (11 ish months) so I figured it was unlikely to be related to that. Perhaps the syslog will shed some light on it.
No crash last night, but it doesn't happen like clockwork so will keep an eye over the next few days.