So I bought these headphones off Amazon about 2 weeks ago. After about a week of using them I see a rack on one of the earbuds. I had not dropped, or done anything to cause this. I sent them back, and got a replacement for them just last Monday. Today I see another crack on the earbud. Has anyone else had any issues with these Bluetooth headphones? I really like the sound, and the usefulness they add to my iPhone, but this is kind of getting annoying to deal with.