3 new devices are not able to connect to internet

Hi, 

We got 3 new apple 16 pro iPhones and none of them are able to connect to home wifi. We are getting error as "This network is operation on Wi-Fi channels in use by other near by networks". On the admin tool, both 2.5 GHz and 5 GHz are using WPA2 while there is 6 GHz as well which is using WPA3.  

I have already tried below troubleshooting / resolution steps which works for only few minutes.

1. Forget Network and join again

2. Location services off, connect and then on again

3. On the admin tool, disable 5 GHz, connect to network and enable again. 

So far it connects to wifi for few minutes and then disconnects again and then run into same error message. Have never encountered this error earlier. Its super frustrating to keep on doing the resolution steps again and again.