First I would try to reboot a router and monitor for a while - is the number of errors the same or reduced.
Next - I would check all firewalls to do not block traffic from the storagenode (to any host and any port from any port) and to storagenode (from any host and any port to the TCP+UDP port of storagenode).
If you use a VM, then try do not use the VM and run docker container directly on your host.
Sometimes configuration of the network could be non-standard, see Node could not start since yesterday - #13 by ChristianDresel
Such errors could be also because of some hardware problems too (drop packets), but troubleshoot this type of issues is much harder.