Volumio 2.575 on RPi Zero W with Justboom DAC Zero

Hello Volumifriends,

I am having some problems with a portable player I’m building with a Raspberry Pi Zero W with a Justboom DAC Zero and Volumio 2,575.

With a fresh SD card Volumio starts up through the hotspot and I can configure the justboom DAC, jsut as I’ve done numerous times with my living room Volumio system. At the end of the first configuration process I need to reboot, of course, but then an error message is displayed (too short to remember exactly) that Volumio cannot reboot. Turning off and on again does not remedy the problem. Neither the app nor the browser can connect to Volumio.
This also happened with versions 2.526, 2.555.
Please help!

Kind regards,