My Xiaomi security cameras are connected to the wifi network but one day out of the blue, the 4 cameras I have connected through the Mijia (Xiaomi) App says its all offline.  I have an outdoor camera made by a different company also connected to the Mijia App as well but that worked.  

My first thought was to reboot the main Deco device via the Deco App.  Once I did that, I made things even worse.  The 4 security camera, the outdoor camera, my Ring Doorbell and its connected Chimes are not connected.  The only devices that are able to connect to the Decos are my computer, laptops, smart TVs, cell phones, Google home mini, Chromecast and Google Home Hub.  

I've tried to reconnect the security cameras and Ring doorbell to the network but it would not connect.  It will detect the network but for some reason it just won't establish a connection.  

Nothing has been changed or moved since the disconnection of the initial 4 security cameras. 

I haven't rebooted a second time but wanted to see what the issue is here.  Things were working perfectly fine few days ago.

Thanks in advance.