Sounds like a power supply issue. It’s a good idea to label the power supply cables near the end, and on the in-line box.

To re-seat the cables, use a small hex wrench to open the six screws on the top and slowly lift the lid. I fixed 'headphone crackle in my OT by pulling out the smaller ribbon cable on the left side, cleaning it with compressed air, then re-seating it.

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