I spent a lot of money in these and now left earcup stops working out of no where I was on a phone call when it happened just completely silent
Hello,
I am sorry that you're unable to get audio from the left earcup. I would love to do what I can to help you.
Does this occur with both a cabled and Bluetooth connection?
Lets try resetting your headphones;
Following this, check for any available firmware updates for your headphones. This can be done via a computer using a USB and visiting our firmware update website btu.bose.com, which will provide you with full instructions.
Do let us know how you get on.