Mine too. Bose NC headphones are brittle. For the price one expects higher quality. Right ear has been intermittent and now it does not work at all. Took it to a technician “it would take 1 minute to fix but >an hour to open and reassemble the headphone. So it appears the BOSE headphones are not strong enough to withstand more than say 12 months of wear and tear. And are unnecessarily complicated to repair. For the price, this is sub-standard, low-quality. They are brittle and an expensive piece of equipment rendered useless because a single wire becomes loose.
Bose tech support simply switched me to a third country who offered to replace them for about a 20% discount. I’m switching to SONY.