Sony MDR-1000X Owner's Manual

If the computer enters into hibernation mode while connected to the headset, charging will not be completed properly. Check the setting of the
computer before charging. The indicator (red) will go off automatically if the computer enters into hibernation mode. Charge the headset again in
this case.

Use the supplied micro-USB cable only, and connect directly to a computer. Charging will not be completed properly by an indirect connection,
such as via a USB hub.

Hint

You can use the headset by connecting the supplied headphone cable, even while charging the headset.

If charging starts while the headset is turned on, the headset will turn off automatically.