Why does the internet connection disappear?

Question

Windows

Home network from a red provider: router - switch - 3 devices via LAN + a bunch of devices via Wi-Fi.
With an Internet connection, constant problems (after each reboot) only for one computer (win10) via LAN, it
is solved with several (from 2 to 5) procedures "Network Troubleshooter"
Please tell me where to dig?

Answer 1

1. Connect the PC directly to the network cable. If the problem persists, the provider is to blame (or the wire in the apartment, or in the shield or in the house or on the highway - in any case, the provider fixes it)
2. Connect the router and the same 1 PC to it. If the problem appears, then the problem is either in the router (update the firmware, reset the settings) or in the cable from the router to the PC.
3. remove the wire and connect this PC to the router via WiFi (or another device, but first check it with the wire, i.e. you need to check one device with both the wire and WiFi). If the problem appears, then either the WiFi setting in the router, or the antenna or receiver. If there is a problem on a bunch of devices, then something is most likely wrong in the router.
4. In the router for each of the devices, register the IP address with reference to the MAC address of the device.
5. if the plugs were crimped (approximately) 5+ years ago, then it would be good to re-crimp or just check that the contacts were not oxidized and nothing was bent.
I would bet on points 1 and 2.

Answer 2

Check the cable, router port, computer network card, network card driver settings, and system network settings.
More precisely, fail.
It is not clear what "permanent problems" means - they would tell in more detail about the problems. Losing internet access? Addresses not resolving? Access to the gateway is lost? The computer does not receive the address with DHCP?