[slayerming2]

So I just recently purchased the RHA MA750i from amazon, and it's being a week. And the last few days I noticed a clicking sound whenever I'm walking and wearing the earbuds. After closer examinations I noticed that the earbuds makes the sounds even when their not plugged into my iphone, although it could be my imagination, but it seemed like the clicking sound was less prevalent. 
 
I've accidentally pulled on them hard a few times, when they got stuck on something. Could that have being the problem? What should I do?