Recently I’ve come across a problem that when my QC35 paired with my XPS13, everything is alright except when iTunes is playing music my headset gets no sound at all. Toggling a certain setting will solve this problem:
[Step1] Open iTunes, go to Edit-Preference
[Step2] Select the tab “Playback”, and choose the “Play music using” to “Direct Sound”
[Step3] Restart iTunes, now you can play music on the connected QC35.
I’m not sure why this doesn’t happen on my other bluetooth headphones, but I hope this guide helps.BTW, comments are always appreciated:)