PiCore and HiFiBerry Dac+ and Amp

Hi

Squeezelite is running on my Raspberry3b fine.
I wanna change from 'Headphones' to 'HiFiBerry Dac+ and Amp' by 'Audio Output device settings' and click 'Save'.
After the reboot Squeezelite is not running anymore.
In the mainpage a 'Restart' of Squeezelite does not help.
When I change back to 'Headphones' Squeezelite is immidiatly running again.
It worked fine for 2 years.

Who knows what to do with this problem?

Thanks
Peet