console freez

I'm trying out proxmox for the first time, and I'm running into a strange issue. My Supermicro nodes have four ethernet ports, and I've configured all of them to have different IP addresses on each of my four subnets. When I ssh to one of my nodes, or launch a shell from the Proxmox web ui...

Hi, I have a problem withe the console. I can open the noVNC console for every client/OS and it works properly. But after a minute or two, the console freezes. There is no error message or any info in the Tasklist. Tried other browsers, maschines, subnets - but the console is always freezing. I...