When you turn off the light in one room, the network card on the PC in the other is turned off, what kind of anomaly?

Question

Iron

This may seem like heresy, but the pattern has been empirically verified a dozen times;) In one room there is a Dell desktop PC with a built-in network card, a network cable from it goes to another room into a TP-LINK router, which, in turn, is connected to a modem. So, it has been empirically proven that in a room where a router and a modem are connected to the electrical network - when the light switch (1 light on the ceiling) is switched to OFF mode, in another room the network card is turned off on the PC - the LED on the card and in the tray stops blinking shows that the network cable is not connected. The transition to sleep mode and the exit from it helps, everything is restored. With all this, Wi-Fi, distributed from the same router, works stably. The situation is mysterious for me, what could be the relationship?

Answer 1

the grounding in the apartment is not normal, and there is 110v between the devices, so they break through the local grid, try to power the router from other outlets and check the PC is turned off

Answer 2

well, maybe during the opening there is a power surge and somewhere something goes into an abnormal mode of operation

Answer 3

The simplest solution is to insert a discrete network card into the computer and forget the problem.
If you want to find the reason - first connect the computer to another port of the router or to the modem.
You can temporarily throw a piece of network cable across the floor from the computer to the router, see if the effect of the "light bulb off" remains or not. Based on the result, think further.
There is nowhere to take a piece of cable for a test - move the router to the computer. That is, plug the router into the modem with a long cable, and the computer into the router with a short one.

Answer 4

When laying the wire, did you happen to place it next to the 220V wiring?