I found out that some of my programs were incompatible with El Capitan so I downgraded with a clean install back to Yosemite. Ever since then my bluetooth headphones have been choppy and screechy, I didn't have this problem prior to updating to El Capitan nor did El Capitan have that problem. It only started now that I'm back on Yosemite. Apple has been useless in support as their only answer is that it might need service. I really need help because I don't want to go back to El Capitan.