Why do HyperV Server NICs hang?

Question

Computer networks

Hello everyone
There are two large servers with Hyper-V Server
On one 1c Server and SQL Server
On the other a file server, and a couple of special servers.
So, some time ago, network interfaces began to fall off, first at one server, now at two:
Communication with the server
disappears Through the HyperV manager, you change the network card and everything works fine.
Updated HyperV Server drivers, gigabit ports
The load on the ports is minimal (one server per port)
Please help, what happened, I can’t understand, the traffic through the network is minimal.

Answer 1

There was a similar problem caused by KB4338818 (the problem is documented in MS, a patch is promised in the near future), fixed by rolling back the fix. See what updates arrived in the guest and host systems.