Hey guy's, I bought a pair of HD 598's about a year ago next month. They have popping/crackling sound every so often. I sent them in once for this problem and the tech said that it was because of hair inside the heaphone. He cleaned them, and sent them back but he said they weren't covered by Sennheiser warranty even though I bought them from a Amazon fulfilled seller. So now after a few months they are starting to do it again I tried cleaning out the hair and it didn't help. What should I do? also when I was cleaning them a screw got stuck against the magnet and I had a pull it off not sure if it screwed it up any more than it was, but I'm thinking about just selling them and getting something different. Thanks in advance for the help.