The QC35 Bose headphones I have are on their second ear cups, have years of daily use and I think I have run into pairing issues maybe a dozen times. And usually it was to do with having lots of devices in my history that are actively in use and it’s understandable it might be a little confused. It’s been trivial to purge a few less frequently used devices, turn them off and on and that’s it it’s good again. They’ve been an absolute joy and honestly the only feature I’m looking for to make me consider a new set of over ear headphones is being able to listen to audio from more than one device at once… it can be paired to two devices so I can quickly pick up an incoming call, and it will play audio from one or the other depending on which is muted or plays first. It won’t switch back and forth if any background audio (even inaudible silence seems to trigger this)