I just want to paste this here. Most of my server's are reboot every 3 month's, it's company internal rules.
I know - some one have more big uptime.
Just save this to memory
I think, it's time to install latest PVE version, java kill me.
Uptime of a Proxmox VE node doesn't bother me, I prefer to have newer (but stable) software running, the version you are running is way too old. Only thing that does bother me is that the HA-cluster have a 100% uptime since day 1 (and with this the VM's running on it)...which it have (except little downtime that comes with upgrade from PVE 3.4 to 4.1).