@Ricardo_Nunes 

Good day,

Thanks for your detailed information.

We would like to collect some information and forward your case to the senior engineers.

Please have a check of your email box later.

1. May I know how the 3 Deco M5s are connected to each other?—it would be great that you could draw a simple picture about the network topology of the Decos and the ISP modem router?
2. Does it matter which Deco was the NVR connected?
3. As for the Deco that was offline form the network, it is the one NVR connected, right? And would it become red as well?
4. How long have you had the Deco and did this issue start since the beginning, or just recently like a firmware update?

Thank you very much.