Too many entities cause the computer to disconnect from the network

When I create a LAN connection, if there are too many entities in my world, it will cause my computer to disconnect from the network.
After the network is disconnected, I can use the computer normally, and the wireless network card can also be used, but the computer cannot be shut down normally. I can only press and hold the start switch to force the shutdown. After restarting, my keypad switch is turned off.