Personal handling methods are as follows

1, check the system for Trojan virus.

Some Trojan viruses continue to send data once connected, blocking the network.

2. Check whether the cable connector is in good condition.

The network cable of school dormitory is generally very long, and the signal is easily attenuated.

3. Check whether the router is overheated.

I don't know the network layout of your dormitory. If the dormitory is used by many people, you can check whether the router is aging and hot.

You should also look at the basic network settings.

Education networks are generally assigned ip, I remember, so if you have nothing to do, you can consider changing ip. If you are a notebook, you can try another ip directly next door.