Hi @airtas
Welcome to the Sonos Community!
Could you please uninstall the Sonos app from your device, reboot the device, then reinstall the Sonos app and select Connect to Existing System when you start it up again? Thanks.
Please then test playback of On This Mobile Device again.
Hi @airtas
I think I might have misunderstood - is it the app that freezes, or playback?
If it is the app that crashes/freezes, please let me know the Android version of your device (phone settings » About Phone » Software Information » Android Version. (or similar)
If, however, it is that the playback stops, there could be a few causes. The Now Playing screen not updating is normally an indication of communication problems on the network (and playback stopping would be another indicator).
The first step I suggest you take is to reboot your WiFi router by switching it off for at least 30 seconds.
If that doesn’t help, is the Android device staying still or is it being moved throughout the house in your pocket as you’re playing? If it’s the latter, please test without moving the Android device.
Do you have another Android device you can test? If so, please do so and compare.
Are there areas of your home where things seem to work better? If so, there could be WiFi range or interference issues. I’d recommend a read of our reducing wireless interference help page. The first thing to check would be that the router has 1m space from anything else that may be transmitting (like a cordless landline phone base, Sonos speaker or WiFi printer).