I know, that this answer is coming way to late, but for people with the same problem:
There is actually a predetermined breaking point in this headphones
As we all know, we can tilt the headphones
When we tilt the headphones flat, there is actually a little plastic knob to stop the headphones from tilting more.
But in the other direction the connection cable between the left and right speaker is preventing the speakers from tilting more.
So this cable will get stressed more and more over the years.
--> It will break at some point and then you wont hear anything on your right speaker
Its actually not that difficult to open up the headphones, if someone needs help just message me
(I believe this might be the same with the other versions of this model, but i am not sure about that)