[PROBLEM] System freezes after a while

[rph-r]

Hi,
I'm a happy new Moode user. It's running with
-a RPi 3
-an Audiophonics Evo Sabre
-a raspberry touch screen
-a local network on my router, with cable
-up to date last Moode version

Everything works fine, but after ~1h idle, it doesn't respond anymore, the touchscreen light on after some taps, but remains unresponsive, ssh and web iterface stop working.

Is the issue known?

thank you!