[PROBLEM] Spotify unreachable after DAC input change

[tdubb]

TL: DR Spotify Connect becomes unreachable after the input of my DAC is changed away from the USB (RPi input) when connected to Spotify or if I try to connect to when the input is not USB.

Hey All, I'm trying to identify/diagnose an issue I have come across in moOde while using Spotify Connect. I am not sure if this issue is at the librespot or moOde itselt. I do know that I am fairly ignorant at debugging software issues.

Setup:
Raspi: Pi-4B 1.5 2GB
Audio: SMSL USB AUDIO
moOde 8.1.2
Source: Spotify Connect
DAC: S.M.S.L. DO100 connected through USB

Issue:
If DAC is set to input other than USB (RPi connection), Spotify Connect "errors out". At this point, the moOde Spotify Connect device is no longer available.

Steps to reproduce:
DAC set to USB, Spotify not connected to moOde:

1. Connect Spotify to moOde Connect device.
   
2. Change input on DAC away from USB 
   -->Spotify pauses and disconnects from moOde 
   
3. Change input on DAC back to USB (as if I am going to listen to music again)
   

DAC set to input other than USB, Spotify not connected to moOde:

1. Connect Spotify to moOde Connect device.
   --> Spotify does not connect to moOde.
   

At this point, in either mode, moOde is no longer available to connect to from Spotify, even if the DAC is set back to the USB input.

Workarounds:
Avoiding the issue:

• Verify that DAC is set to USB input before connecting Spotify.
  
• Disconnecting from moOde Spotify device before changing DAC input.
  

Resetting the issue:

• Click "disconnect" from the "Spotify Active" screen of the moOde web ui.
  
• Restart RPi
  

It appears that the player handles this with the internal player when playing internet radio stations.