Unfortunately, for some devices that support apt-X codec is not enough, the Bluetooth transmission power. (Apart from the fact that so far only very few of them are)
While the 20m receiving radius are almost reached by a Note 10.1, reaching the transmission power of a One X even if it alongside the recipient .- lays directly> choppy to no sound, if you get a link back occurs during song changes again jumps in the music.
Edit:
The Weak transmission was actually on the phone -> One X that has a hardware failure in that respect