Network Card.
The integrated network card died, at first the Internet speed dropped from 300 megabits to 100, then to 10 in general and an inscription appeared: unknown network, without access to the Internet.I bought a new network and the speed became 300 megabits, but a week later it was again 100.
Because of what can the network die?
Ixiot wrote:
Why can network die?
There should be no such thing. You most likely have software problems.
maybe some kind of interference, incorrect flow through the network of overestimated parameters
kurskiy
This was the first thing I ruled out. Connected to the laptop and the Internet plows at a normal speed.
Botponevol
This is also ruled out. I reinstalled Windows from the off site and synchronized with the license through the Microsoft account. I downloaded the official drivers. Native network card does not plow.
Ixiot
The only other thing that could still be a problematic motherboard or power supply.
I also had something similar, though not on the network card, but on the modem. Internet suddenly went down. None of the pages could be opened. And everything was restored after resetting the modem settings (I have an ADSL modem), but after a short time the problem completely repeated. As a result, I found out that the computer was infected with some kind of malware that overwrote the modem settings. I cleaned the computer with the Kaspersky program, for greater certainty I changed the passwords on the modem. After everything worked!
So if the problem is repeated with different modems/network cards, the possible cause is a virus that overwrites some system settings, and the card cannot work correctly.