Digi + pro output to DAC not stable

I recently add a Raspberry Pi 7” touchdisplay to my Raspberry Pi 3B and Hifiberry Digi + pro setup. I use a 5V 3A switched mode power supply. The connection to the external dac (DAC Magic) is not stable. At reboot the connection to the DAC is not always intitialized, on the Toslink and SPDIF output. Sometime it works, sometime not. Are there any expiriances with this problem and any troubleshooting tips are welcome. Thanks in advance 


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