When going into sleep mode, the Internet is cut off. What to do?

Question

Windows

As soon as my laptop goes into sleep mode, the Internet connection immediately breaks. What is the problem and how can I fix it?

Answer 1

In the power settings, set it so that when the lid is closed, it does nothing. You can even do it differently for different connection sources (for example, when working over the network - do not turn off, but from the battery - turn off).

Answer 2

As soon as my laptop goes into sleep mode, the Internet connection immediately breaks.

Of course, that's how it should be.
Sleep mode is the minimum power consumption, the execution of all programs, including drivers working with the network, stops.
Sleeping computer.

What is the problem and how can I fix it?

There is no problem, therefore, nothing needs to be fixed.