Firstly we need to check the network infrastructure and Lumin operation. Instead of Roon, please try Tidal app Tidal Connect, Qobuz app Qobuz Connect, or Spotify app Spotify Connect to P1. For Tidal / Qobuz you need a paid subscription or a free trial, but a free account does not work. Spotify free account will work, if you don’t have any of these.
See if these streaming services can play (on repeat or Auto Play) for several hours without any abnormal issues.