Hey @James_O_Brien – a good overview of the current state of WiFi can be found here.
I would also tend to think that the powerline adapters are the problem here, but you can confirm that by moving some gear around and testing using ethernet temporarily.
We do some pretty aggressive buffering, but we don’t buffer the entire song, so it’s possible Roon is a bit more sensitive if your network is having issues here. Lets confirm that’s the problem James, then we can help you get this solid. Testing with the powerline stuff out of the way is a good first step here.
Thanks!