Glad to hear that the update has helped with responsiveness. Maybe resetting the phone to factory default settings or double-checking that there is no active VPN on it may help? It’s very strange that it’s just that one phone and not the others.
@noris, resetting to factory is quite extreme solution…
consider that the phone sometimes connect, sometimes not (with no change in home network whatsoever)
and that other android devices DO connect with no problem in the same configuration.
so my best guess is that there is some problem of roon with that version of android (5.0.1) (other devices are newer).
I agree that factory resetting is a bit of an extreme solution, but other than giving this a try I am not sure why other Android phones would be working without issue and this one wouldn’t. Seems like the issue might be localized to the phone itself.