I said earlier that the repetitive form of this problem had gone away.
It's now back, after the kernel and various firmare files were updated
yesterday. I was away from the system this afternoon and found sad
faces across the screen on my return. Does this help?
sudo journalctl --system -r --since="2019-09-05 12:30:00"
--until="2019-09-05 13:30:00" | tee /tmp/ANOM_ABEND.txt
I'm afraid I got misled by the -r there, which puts the log in reverse
and was inherited from an earlier command line. So the core dumps
follow the event... Sorry.