DAC plus stopped working with steel case


I have a DAC+ for few years. I use the steel case (https://www.hifiberry.com/shop/cases/steel-case-for-hifiberry-dac-pi-4-2/), and since few days, DAC+ connection is frequently lost, it now stopped working when I use the steel case (ne sound, green led off).

I tried without the case and then it works fine.

What could it be ? Spacers too short ? Electric current that pass through the case ?

How can I solve this ?


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