Bluetooth seems to require line of sight, please help!

I recently bought these headphones http://www.amazon.com/gp/product/B00VE0P...

to use with my 3rd generation iPod Touch. Everything pairs properly and the sound comes through clearly but then when I put the iPod in my pocket it loses signal. I've tried pairing the headphones with my Kindle Fire and I can walk about 15 feet away (out of line of sight as well) before I lose signal.

Any help with this would be greatly appreciated. Would really prefer not to have to buy a new mp3 player.