Problems linking nodemcu v3 esp8266 chip to Network

Hey Ricki,
Thanks for responding so fast. I am not so sure it is WIFI channels or how to check. When the access is not possible, it isn’t possible for any of the monitors in Australia. For instance today the network couldn’t be reached from 9:00 am to 1:30 local time (UTC +11). Attached is a document showing 4 of the monitors not communicating with the network when I was unable to make a connection today.
I think that the Sensor Community network was not available to us in Sydney at that time. I am wondering if it is system maintenance or something similar.
Cheers
Charlie

It seems I can’t paste the screen shots or the word document.