I also have issue with aptX codec on two different pairs of headphones. When aptX is enabled (either via bluetooth settings or forced via developer tools), instead of music I can only hear popping in regular intervals (on one pair of headphones it happens immediately, on 2nd one only after few seconds of silence). This popping sound persists for some time after music has been stopped (it depends on how long I've tried to play sound) and if it persists long enough, one pair of my headphones are not responding and I have to force them off by plugging charging cable to bring them back to life.