Access Point Temporarily Full

Hi,

I have 14 devices in my home connected to Xfinity gateway, half of them are using 2.4G and rest are using 5G. Today morning I've noticed that couple of my devices are unable to connect to Wifi and the message I see on my Android phone is 'Access Point temporarily full', Apple device is showing 'Network is Temporarily Unavailable'. No new devices were added overnight.

While going through the settings I've observed that 'Xfinity WiFi hotspot' is enabled, and after disabling this my device was able to connect.

I left and when I came back home after some time, I see this issue again, my device is unable to connect again and 'Xfinity WiFi hotspot' is still disabled.

This is happening with multiple devices, randomly. If I disconnect one, I'm able to connect other. This is really weird.

Restarting the Gateway doesn't help, and I didn't find any solution online.

Any help is much appreciated.

Thank you.