Okay… this might be a coincidence but twice I’ve set the Bartok to play an album first thing in the morning and it’s crashed. e.g. this am… selected album on the app. Selected Play All. Bartok switches on and, within a few seconds, starts to play the first track. The first track was only 52 seconds long. At the end of the first track it locks up. It shows 52 seconds on the display and doesn’t start the following track. Also unresponsive via the app but it shows the unit is still there and still playing at 52 seconds of the first track. Switching off /on via the front button and the display still shows exactly the same and no playing. The only fix is a complete power off/on via the mains switch.
I had the same issue a few mornings ago BEFORE the latest update. Today it was latest updates from a few days ago all installed.
The rest of the day, and for the last few days, it’s all fine with no issues playing from radio or upnp.
If it helps, one thing that might make my use a bit different is I have the tablet (Android 8.1) set to stay awake all the time. So it doesn’t go into standby or even screen saver. I do this so there are no delays or issues reconnecting when waking up again. The tablet is always showing the mosaic app.