Network Icon Disappeared but Settings show connected

My iPad is running 18.1.1, has just lost the network icon top right of screen. In settings shows I am connected but is not working. First I got “No internet connection” message on the Network, then “This network is operating on Wi-Fi channels in use by several other nearby networks.”

I restarted the router and it’s not the problem as I am using my iPhone on it with no trouble.

I also reset the Network settings and turned the iPad off and on.

No change. Help!