I have a MacBook Air, mid 2012 running the macOS 10.12.4 beta. Since recently, my headphones stopped working. If I plug them in, the computer still uses the internal speakers. And if I go to system preferences, I still doesn't recognize my headphones. I've searched the web for this problem, and I saw that some other people have the same problem. I can only fix this by restarting, but that's very annoying.
Can anybody please help me?