Last week I noticed that my ipod touch's sound cuts out whenever the plug (from headphones) is pushed against the BACK of the inside of the line in jack. (if that makes sense)...These headphones work fine when plugged into other things. This really sucks, as I know of no way to fix this. Is this common, or is this easily fixed? I got it in May 2009 from amazon, and I no longer have the original receipt. Advice please?