My computer keeps getting disconnected from router?

Just all of a sudden my computer disconnected from the router, and whenever it tried to reconnect it would just have limited access and would not have any internet access. I tried restoring my computer and nothing really happened. Right now I can connect to other internet connections fine, but when I try to join my regular router it just keeps connecting for a second then disconnects itself and keeps connecting and never works. I'm not sure if its the router's problem, as both my other computer and my phone can connect fine to the internet on my regular router

Once check with the router settings because if your ISP is providing any dynamic IP or DNS assigned IP address the router automatically detects and assigns the certain IP to the connected devices and once check with the router before connections.

If the ISP providing the static IP address you need to enter the IP address, DNS, and gateway in the router settings it should be configured then only it allows the Internet to the connected devices.

One more option is that where the router has some qos services like where you can specify mac address you need to connect to Internet and check whether QOS is disabled or not. It disconnecting automatically which means the problem is associated with the router and hard reset the router, to configure the router follow the router manual.

May be your system is infected with the virus and clean the whole system with any security programme or the network drivers are not functioning properly