I have just recently bought this headset, and I`m a bit worried that the mic changes the volume all by itself, while I`m speaking. So it`s like going from a good volume to a very low volume, when the others can barely hear me at all. And all of a sudden it goes back to normal. I don`t change the position of the mic, nor do I raise or lower my voice. 

Can you help me solve this issue?