No longer able to mount NFS shares

Hello,

I have several NFS mount points shared on my local network from a
FreeNAS server running version 11.1-U7. My OBSD client computer is
running 7.0 GENERIC#224 amd64.

For the past year or so it has been very slow to connect to the NFS
server, so slow in fact that I use the '-b' option to fork to the
background and stopped trying to mount at boot. About six months ago I
moved our home network to an Ubiquiti set-up. Since then my OBSD client
is even slower to connect. I have Macs running different levels of Mac
OS that, while now take up to 15s to connect, all do connect. Also, a
Raspberry Pi 4 server can connect quickly to the same shares.

Once connected, writes are fast and I do not lose connection.

For the last 48h I have not been able to connect from the OBSD client
at all. I have restarted the server to no effect. All other clients on
the network can connect to the NFS shares.

Example of what happens with the command:

doas mount_nfs -T -i -b 192.168.1.21:/mnt/XFree/backups/share
/share

mount_nfs: bad MNT RPC: RPC: Timed out

Any suggestions would be greatly appreciated.

Thanks, Aric