Under load, the NFS ball falls off, where to dig?

Question

NAS

Home server with Proxmox, on it, in a virtual machine, OMV. Two disks are thrown into OMV, from which she distributes the balls. Including distributes NFS to the ball, which Proxmox uses to store other containers. This ball periodically falls off. Only restarting the daemon in OMV helps. Under a small load, everything is fine, but as soon as the container is launched, the ball is guaranteed to fall off (the time is different). Logs are empty. I can post configs if needed.

Answer 1

View syslog log

Answer 2

On the host, the logs are empty, on the client, of course, after a while, errors appear that it is impossible to access the ball.