So I gave it a rest and returned to the problem after a few days.
I had couple of "loop2" BTRFS errors that, from what I've read on the forum, are related to a corrupt docker image. I've since deleted my docker image and recreated it.
Secondly, after recreating my docker image, I pinned each docker to a specific CPU so I could find if there was an offending docker container. I think I found one. If I restart my nextcloud container while my mariadb container is running, I get:
kernel: php[8525]: segfault at ffffffffffffffff ip 000055871823b0b2 sp 00007ffd6737dd40 error 7 in php82[558718200000+2b4000] likely on CPU 5 (core 1, socket 0)
I get this error reliably when starting my nextcloud container.
Is there anything I can do to fix this? Is my nextcloud appdata corrupt? Thanks!
syslog-192.168.0.10_171223.log