I have no idea personally, because I don't like 'features'. They break and cause more annoyance/costs then they are worth.
Quickly looking it up, there's a switch that triggers it. If you close the switch and force it to stay closed, it shouldn't do this ever.
Someone else on the interwebs states:
You can cut off the plastic piece that presses down on the switch above the left earcup
Do whatever at your own risk obviously. But it stands to reason that the switch just needs to be forced closed to make it always think you're wearing them.