Please also look into the already existing thread with the Sony WM1ZM2/AM2.
Keep in mind a device running some Android is not guaranteed to be a working base for roon or roon ARC client, esp. DAPs with their very own audio hardware are known for rather not supporting roon. At least when reading DAP related issues here.
Ah, okay. What did you change in between, software update of DAP, software update of roon/ARC client on DAP, software update of roon server, any network changes?
Keep in mind, in case of roon software update always update both sides client and server.
We have an active ticket open with our R&D team regarding this specific issue on Sony WM1ZM2/AM2 devices. We’ve added your topic to our internal tracking for this investigation.
We’ll go ahead and close this thread for now, and if any additional information is needed or once there’s an update from the developers, we’ll post it here.