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Hello everyone, What I am looking for: Portable (should somewhat be able to fit in a pant pocket, "smartphone sized") Bluetooth Input (at least version 5.0 + aptx would be nice) Digital inputs (coaxial/optical) Decent SINAD (at least considering the price) Basicly I want a somewhat decent amp...

I changed RCA cables, I switched AC sockets, I checked without RCA cables, tried a different DAC. I tried grounding the unit. Nothing really helps. How can I fix this? It worked fine the first few weeks.