Reply to S4 Headphone cue feedback

I posted in the General community too. Anyway, I updated to 2.6.1 and now I'm getting feedback in the headphones. It doesn't happen at start up, but about 10 seconds later, it gradually gets louder. It's only happening in the right cup. I've tried different headphones, so it's not the headphones. It's either something with the S4, or the update. After I updated, I didn't change a thing with my set up. I updated, re-analyzed all my tracks, plugged into the S4 and boom, feedback! It doesn't matter if the "cue" is hit for not. It's constant. The S4 is only a couple months old. Any ideas?