I have been using the Lightspeed Mach 1 for about 4 years now. I had a little trouble at first with a similar popping sound after about a year, but I sent them back and got a brand new headset and it has worked like a charm ever since. Lightspeed customer service is second-to-none, so if you send them back it shouldn't be a problem. I fly the E-170.

PoK