Increasing amounts of static that can be eliminated only by readjusting the earpieces (sliding them up and down the headband until you find the elusive "silent spot"). Bose said, beyond warranty, sorry. It's been getting worse over time, but I can still manage to find a silent spot, and as long as I don't readjust them, the sound is as good as always.

Audio Players & Recorders - Bose - QuietComfort 3 Acoustic Noise Cancelling Consumer...