Hi, I have the 3x Deco M5 set and successfully set up the network. However, I needed to unplug and reconnect it, and after restarting both nbn box and primary m5 unit, it couldn't reconnect. Solid red light. I deleted the old network config, did a reset on all units, set up the network via the app again, and it was fine. 

Then today I tripped a fuse and lost power... After reconnecting power the Deco unit again could not reconnect. I looked up available WiFi any my custom network name was gone again. Only "Deco_4614" available. Again, I had to delete the old network config, reset all units, set up the network via the app again, and it was fine. 

Obviously I don't want to have to manually reset and reconfigure the network every time the m5 is either  unplugged or restarted... Is there any advice on how to get the m5 to remember the network settings?