Thanks for reaching out to the community, I am sorry to hear that your QuietComfort 35 II headphones are experiencing clicking.
I want to help get these working for you. Could I ask, this clicking noise you describe does it happen even when it's not paired to a source? I'd like to figure out if it's possibly a connection issue or a hardware issue with the headset.
Can you also confirm if this happens with a cabled connection as well as Bluetooth?
I look forward to hearing from you.