Hello Guys, sorry for my english again.
My MDR1000X arrived this week and it has the disturbing noise to on left ear cup too.
There are two different noises, sometimes a little crease from the earpads that isn´t really annoying.
And the second Sound like a click/click by yawning, eating, moving the lower jaw or head complete, sometimes just by walking.
First time i tried to tighten the screws or screw on, but without success.
Next suggestion it could be a cable inside rubbing at anything, so i shake the headphone
No success.
Then i was trying every move to force the clicking noise and success.
I could reproduce the clicking Noise with my hands.
This Movement between this 2 Pictures is the key to the clicking noise.
Little movement between this two positions will force the annoying clicking noise. But only by carry on your head.
If you lock this movement, the clicking noise is away. I locked first time with toilet paper just to fix and test
Later I put little label sticker in each of the four corner.
After this modification there was no clicking noise, and fortunely after removing all Labels from the corner there ist still no clickin annoying Noise
there and i am very very happy with these great headphones.
Don´t really know what affect the noise is disappeared, but perhaps it will give you hope there´s a chance to eliminate.
Since one Day there is silence