Why is my computer causing internet issues for my whole family?

There are a few possibilities here. One is that your router might be struggling to manage traffic—games often take priority and could be slowing down your family's internet use. Another thing to consider is whether your router is malfunctioning; they can start to act up before they fail completely. Also, could your internet connection itself have issues? If possible, try connecting directly to the modem to see if that resolves the issue.

Try using TCPView from SysInternals. It will show you what applications are using your network connection. Sometimes you might have apps that are hogging the network resources, which could crash your router due to overloaded traffic.

It sounds like there's a lot going on! First, I’d recommend gathering some details before troubleshooting further. What type of device are you using—laptop, desktop, wired, or wireless? Also, what's your internet speed and who’s your internet provider? Lastly, check your router settings—have you disabled UPnP? Any changes to those settings could be affecting your performance.

This happened to me once during a Zoom call. My internet would drop every time I joined, but my hardware was fine. Maybe it’s specific to what you're doing online while connected—like gaming or video calls? Have you noticed if it only happens during certain activities?

Consider investing in a new router designed to handle more devices and traffic efficiently, especially since many households now have multiple smartphones, TVs, and computers connected. A model that can handle 16-32 devices might be a good fit for your needs.