I would suspect interferance as well... Unless your totally attached to being wireless.. I would suggest a set of "Sennheiser PC-350" they are OMG good :P

http://reviews.digitaltrends.com/rev...-pc-350-review

Expensive but great... Wearable for hours and hours since they are over the ear and not on the ear. Wife hates them cuzz they are noise canceling so i can hear #$#$