Severe feedback in left ear of Bose QC25 noise cancelling earphones
About two weeks ago I started getting sporadic feedback noise in my left ear which has gotten progressively worse to the point my earphones are unusable as it was doing it most of the time while trying to wear them but would stop if I took them off. Today in trying to diagnose the problem I took the cushion off and then realized I could cause the feedback to start merely by moving my hand over the opening. I didn't actually have to touch it, just had to have my hand very close and the feedback would start. I move my hand away and the feedback stops.
Any suggestions? I bought them 3 years ago so I'm outside the warranty range.