Thanks for your quick reply.
I have done multiple reboots, I tried reseating the card in the same slot.
I am using binhex plex pass. It has been working fine until a couple of days ago. One morning I saw plex pinning some cores, it didn't appear to be doing any scheduled tasks so I tried to restart the docker which failed. Upon eventual reboot i got no devices found.
Interestingly when this issue first occurred, a reboot fixed it but not the second time.
I'll look into that syslog message. Thanks again for your time and hard work.