My Samsung Galaxy A52s 5g indicates on the settings-item “battery and device maintenance” that the Volumio app is an “app with app-crashes” and therefore should be placed in deep sleep. App works normal and without problems.
???
I guess you mean “Battery and device care”? as maintenance I can’t find.
I do see Volumio under “Frequent crashes” but it seems more related to a connection loss (like Volumio device shut down), or swiping for application close?
But then again I see this for all other applications I use:
- Volumio
- VolumioControl
- Gizmo
- mcontrol
- BubbleUPnP
- Squeezer
Possible; I have a Dutch version. I nearly don’t have connection loss, nore application close downs. App is working “normal” as it should.
That the only correct version. 
So in your case Volumio and Volumio app are running 24/7?
Volumio (in Primo) 24/7; app sometimes restart Samsung… Once a month (average) or after software update restart Primo or router.