@Sdaniel105 What are the color of the LED lights when the issue happens on your Decos?

What you can try to do is to leave your Deco units powered on, and just to reboot the modem to make sure the main Deco is getting a internet connection.

You might have an issue where not all of the Decos updated, you can try readding them back into the Mesh network and the app will let you know if the unit needs to be updated.

Same iuse on

my deco system all all in green and update to tje same firmeare all system 6 unit are updated and all in green and my iphone dont conect to wify or my tvs or my imac before that firmeware evreything was working perfect 

need some helo to go back old firmware o please fix tje New updtae 

@Saidbarba Please try the suggested fix posted here: https://community.tp-link.com/us/home/forum/topic/156171?page=1

All Green. 

Connects and works fine if I connect to insecure guest network.  

IP Conflict nearly every time when I connect to normal secure network with windows 10 Dell. 

@Sdaniel105 

Has the Deco system been updated to the latest firmware?

If so, do you continue to get IP conflict errors?

Also, what is your network topology?

It updated several weeks ago, but still get IP Conflict it I connect to secure side of network. 

@Sdaniel105 

Make sure no other device is running a Static IP address or even the computer itself. The network should be configured to get a Dynamic IP adderss.