[Ieyasu]

sounds like a classic case of a broken wire from stress.

in all likelyhood the only real fix would be to open up the headsets right speaker and check the connection.

I dont think the headsets have such faulty wiring so much as the constant action of putting them over your head and moving them about can fatigue the wires sending signals to your speakers and cause them to sound like theyre cutting out as the wire goes from making contact with other part of wire and then being pulled back apart. This is why if you bent the wire in a odd way before on other headsets they would work.

if the wire has come detached from the speaker itself your only real bet at repairing it would be to solder it onto the contact point again. if the break is in the wire you can simply locate the break and splice the wire together. of course if your headset is under 2 years old its possible its still covered under warranty and that would be your best bet as opposed to trying a repair yourself.