second ipod audio jack ruined?

I recently bought a new iPod because on my last one the audio jack was messed up and I would only get sound out of one side. At first I thought it was the headphones but I've tried different ones and the same thing happens. So on this new after the second day my audio jack messes up but this time instead of getting sound out of just one side I get a really distorted sound and you can't even make out the music that is playing. This is really frustrating. I just bought a new iPod and the same thing happens. I don't know if this makes any sense but maybe the AUX cord in my car is ruining it or maybe the AUX cord that I use at work.