Thank you for your reply.
I sent log files via Symfonium app. Please comfirm it.
I don’t understand about UPnP well.
But UAPP has 2 cast mode.(enable Bit Perfect option on=file transfer, unable Bit Perfect option=streaming)
and Neutron Music Player use streaming for casting to renderer by WAV or Flac.
I think they both use internal decode, and stream decoded sound.
You are mixing completely different and unrelated things.
Please as asked open a proper issue with proper details, in those logs you cast to Neutron via UPnP and Neutron stop answering for no reason, meaning there’s a bug there.
Neutron is able to play anything and should not require transcoding so it’s something that should be fixed on their end if that’s why you are trying to achieve.