Periodically the router drops the connection

Hello, I have the following problem: I recently had to disconnect my printer from my computer, and as soon as I did it, I lost internet. I thought it was a lan cable, so I replaced it, but the problem persisted. In a nutshell, the internet in the house is set up like this: the internet goes through a cable to a router and a router, from the router the ethernet cable goes to the router, and the router has a cable connecting the computer to the router. As soon as I disconnected the printer, the router started flashing all the diodes frequently and the wi-fi went down. I unplugged the lan cable to replace it with another one, and suddenly the internet and wi-fi worked on all devices and computers except this one, which is the problem. I put another cable and the computer began to receive a signal from the router (that is, the icon of connection became normal, as on windows 7 and the Internet worked, the Wi-Fi itself is not lost), but still often loses connection between the computer and the Internet and wi-fi is lost. I hope I have written clearly, if there are any questions – I will be happy to clarify. I look forward to your help.