Everything is simple here, so you should not have any problems. You need to go into the settings of the router, well, I hope you already know how to do this, I wrote about this many times already. Probably have to again, very briefly :). Connect the router to the computer via a network cable (at the time of setup) and enter the address of the router 192.168.1.1 in the address bar of the browser. Enter your username and password and click “Submit”, enter, or whatever you have, it does not matter.
Go to the “Wireless” tab and on the left we find the “Channel” item.
Near it there is a drop-down menu in which you can select a channel. I advise you to try several channels, in your opinion, after each channel change, do not forget to save the changes by clicking the “Save” button and restart the router. If you already have a certain number near the “Channel”, then try to set the value to “Auto”.
There is a program where you can see which channel is already occupied by neighboring Wi-Fi and which is not, it is called inSSlDer. But I will not describe it here, because it is more suitable for setting up a Wi-Fi network for more stable operation. And this is the topic of another article. Although your devices find a lot of neighbor networks, you can try this program.
Try the method that I described above, it definitely won’t be worse. And judging by the reviews on this site, the steps to change the Wi-Fi channel on the router really help to solve the problem with unstable Wi-Fi operation, or in general, solve the problem when no device wants to connect to the Internet via Wi-Fi, or connects, but the network is without access to the Internet. Good luck.