Probably related or caused by:
root@smkislamkrembung:~# systemctl status pve-cluster.service
● pve-cluster.service - The Proxmox VE cluster filesystem
Loaded: loaded (/lib/systemd/system/pve-cluster.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2025-06-03 14:15:40 WIB; 2min 53s ago
Process: 986 ExecStart=/usr/bin/pmxcfs (code=exited, status=255/EXCEPTION)
CPU: 16ms
Jun 03 14:15:40 smkislamkrembung systemd[1]: pve-cluster.service: Scheduled restart job, restart counter is at 5.
Jun 03 14:15:40 smkislamkrembung systemd[1]: Stopped The Proxmox VE cluster...
(please do not open multiple threads for one issue - it just causes twice the work)