Windows Server 2019. Why does the Internet disappear from clients?

Question

Network administration

Hello. In an organization, the Internet comes to the server and is distributed to them over the local network. In total, there are about 50 computers in the network. connected via switches. Previously, everything worked fine, but the server's hard drive was covered. I reinstalled the OS (Windows Server 2019), configured the server connection to the Internet. Shared it via connection properties -> access -> allow others to use internet connection. Created a shared folder on the server for file sharing. DNS, DHCP did not configure. ip on all computers registered manually. In general, everything works, but from time to time the Internet disappears on some computers and access to the shared folder is lost. It is treated by restarting the server. What could be the reason and how to fix it?

Answer 1

The reason is you, it is corrected by replacing it with a more qualified one ;-)

Answer 2

DHCP it must
and learn how to test the connection - at least with tracerout and ping