iPod doesn't recognize headphones
My iPod touch 4g only plays sound through the headphones if they are plugged in during boot. If I unplug them then plug them back in, the sound will only play from the internal speakers. The iPod no longer recognizes that headphones are plugged in. If I turn the iPod off, plug the headphones in, then reboot the sound will come out of the headphones no problem until they get unplugged again. This leads me to believe it is a software issue rather than a hardware issue. This happens with Apple headphones as well as numerous 3rd party headphones. I've done soft reboots (holding home + power) and full iTunes restores and nothing has fixed the issue. Any suggestions? Thanks!
iPod touch, iOS 6.1.3