Qbart

So I bought a brand new set of ProMedia 2.1 computer speakers last July from the Klipsch website. Love them and they sound great but recently I am experiencing a problem, every time I plug in my headphones when I unplug them my right speaker doesn't work. I have to unplug the cable attached to the subwoofer (the one that looks like an older monitor cable) and plug it back in. Then the speaker works like normal again. It's a pain because I switch between headphones and speakers a lot. I'm hoping that there is an easy fix for this because I would hate to have to ship the speakers back. Thanks for any and all help!