Hi there, Deco newbire here.

Main reason I bought this solution was to improve Wifi blackspots in living room and garden which were long (ish) distance from Virgin Superhub (cable router and WiFi)

I connected the Main Deco by wire to the lower ethernet port of the Virgin SuperHub. First time setup of my Deco M5 it was in Router mode. Easy setup and the mesh seemed to be working ok (or so I thought).

The Virgin Superhub was still in router mode so it was possible to connect to the original SSID. 

The Deco M5 mesh was also in router mode and offered a new SSID. I joined all wireless devices to the M5 SSID.

And then finally configured the Superhub to operate in modem mode (just to tidy things up and not have another SSID being advertised in my home which wasn't going to be used))

Again things seemed ok, but then I started to notice on Skype calls that internet would periodically be unstable and hence make Skype unusable. I hardly ever had that issue with just the Superhub in place and I was in a place with good connectivity to the Superhub. 

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Could there be some kind of WiFi interference occuring the cases WiFi on the Deco to drop? Or could it be the Wifi connection from Decos back to the Super hub that is poor? (it's intermittent so not sure what to do to investigate)

Would I be safer putting Virgin Super hub back in Router mode and then using the Deco as some kind of AP / wifi extender?

(I have tried this approach but notice that the Decos in AP mode still seem to advertise a different SSID....I had kind of assumed that in AP mode the Decos would advertise the same SSID as the Superhub?)

What really are the advantges of Deco in AP mode over Router mode? I cannot really see this explained in any threads.

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Sorry for such a long thread! Hoping I can get this up and running better to improve overall wifi coverage because at the moment it seems to be introducing more problems!