@SMS101,

Unfortunately, mods can change so many aspects of the game that it would most likely be caused by something there. I know Cyberpunk has a few compatibility report mods that you can run to see if there is something that could cause the problem, or if a mod requires specific ports to be opened.

Does this only happen when you are playing CyberPunk, or is this just the first time it has been noticed? If it happens with other games or you see unexpected behaviors it could be the result of something else, like an old driver for your network card.

What is the Status of the LEDs when the router crashes? Is it rebooting entirely, or did it appear more like it had an outage?

Does the same behavior happen over a wireless connection? What about a different port?

Something like this could be caused by your Modem not being able to handle the traffic or packets that are passing through it. Make sure that your modem is able to achieve the speeds that you are paying your ISP for. Using a DOCSIS 3.0 modem when 3.1 is required could cause this behavior.

I would recommend checking your router logs as you are playing to see if there are errors being thrown that could guide us in the right direction.