Colleting Logs/Troubleshooting a Server Hang

[taco2]

I'm running Proxmox VE on kernel proxmox 5.15.102-1-pve and I'm trying to troubleshoot the following problem:

Every few days my Proxmox server will 'hang' and become unresponsive via Web (timeout) and SSH (key exchange errors). An Unraid and OpnSense VM will continue to function and be fully available over network, but a 3rd ubuntu VM will be unreachable - can't connect via SSH and can't reach web server running there).

I'll check the Proxmox Syslogs, but they seem to just stop without any indication of a failure or kernel panic:

May 23 04:56:47 proxmox pveproxy[1322]: starting 1 worker(s)
May 23 04:56:47 proxmox pveproxy[1322]: worker 73207 started
May 23 05:01:55 proxmox pvedaemon[57327]: worker exit
May 23 05:01:55 proxmox pvedaemon[1313]: worker 57327 finished
May 23 05:01:55 proxmox pvedaemon[1313]: starting 1 worker(s)
May 23 05:01:55 proxmox pvedaemon[1313]: worker 73987 started
May 23 18:40:15 proxmox systemd-modules-load[487]: Inserted module 'vfio'
May 23 18:40:15 proxmox dmeventd[507]: dmeventd ready for processing.
May 23 18:40:15 proxmox systemd-modules-load[487]: Inserted module 'vfio_pci'
May 23 18:40:15 proxmox systemd-modules-load[487]: Inserted module 'iscsi_tcp'
May 23 18:40:15 proxmox systemd-modules-load[487]: Inserted module 'ib_iser'
May 23 18:40:15 proxmox systemd-modules-load[487]: Inserted module 'vhost_net'
May 23 18:40:15 proxmox systemd[1]: Starting Flush Journal to Persistent Storage...
May 23 18:40:15 proxmox systemd[1]: Started Rule-based Manager for Device Events and Files.

Question: Is there any other logs I should check to try and trackdown what's causing the server to hang? Or any other advice on how to troubleshoot this problem