Re: Why is my headphones not working on L735 or L950
This happened to me too on my 950. The headphones were working fine, then out of nowhere they stopped working.
My headphones worked in every single other device in my house: a Lumia 1020, Surface Pro 3, my wife's iPad. I even tested it on an old 920 and it worked.
Lumia Support's answer was "do a factory reset" or "contact the manufacturer of the headphones to see if its compatible."
Unfortunately, you will problem have to buy some new headphones.