I am running the latest, official firmware (1.0.5) on my Deco X60 v2. I woke up this morning with no internet connection, and upon further investigation I saw Deco's LAN address changed from my setting of 10.0.0.1 to the default 192.168.0.1

As expected, this caused all my device's IP addresses to change as well. All of my DHCP reservations changed from 10.0.0.X to 192.168.0.X (causing various conflicts, hence why I had no internet). 

I don't know why this happened. I cannot set it back to 10.0.0.1 either; when I try the generic Deco app's error message appears. I am really enjoying these routers, but perhaps I need to get a separate DHCP server and throw these into AP mode as this is something I cannot risk happening again.