Arlo Smartbase VMB4000 not found by App

[Rosswright]

My Arlo system using VMB4000 was working fine until a few days ago. The base station disappeared from the App Dashboard. I followed the instructions to re-install including resetting the base station to factory settings. 
I still cannot connect the Base station to the app (or any Arlo Pro 2 Cameras….which also now require reconnecting (following the reset). 
I’ve powered up/down and done the factory resets 3 times but am still in limbo.

the base station has green lights for power & internet and amber for the devices LED.

suggestions?? 

[jguerdat]

While it's possible something in the base has failed, are you using a VPN? If so, disable it.

[Rosswright]

VPN is disabled.

at the time that the base station disappeared from the App dashboard, the attached cameras could still be armed / disarmed without any dramas. 
of course, after following the Arlo advice to reset the base station no cameras can connect

[Rosswright]

The base station is still recognised on my wifi network so it is not as if it is ‘invisible’ to other devices - just the Arlo app.

[Rosswright]

Out of desperation I factory reset the base station again and this appears to have solved the problem as I am now able to connect the base station and cameras to the app.

problem solved!