Unable to join my wi-fi network

I got a message on my iPad - unable to join network : this network is operating on wi-fi channels in use by several other nearby networks.

it suggested that I restart my router, which I did. That didn't help. Neither did my fruitless attempts at getting help from the worse than useless chatbot. I also followed some online troubleshooting suggestions. This doesn't happen all the time, but has been getting more frequent & more severe. Suggestions?