Since today (one week after purchase), my MDR1000x has a peculiar issue. When I use it wired and engage NC (with or without ambient functions), the left earcup emits a louder (NC?) hiss, and the sound is lower volume than the right side. When I turn off the headphone and run it passively through the cable, it works normally. Bluetooth + NC also works normally.
I tried resetting to factory settings (7 sec power button + ambient button) but unfortunately this has not resolved the issue.
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