Tons of people with the Elear and some Utopia have owners reported similar problems. Its a known problem, and the reason I moved on from the Utopia. I didn't want to deal with it happening again. I hoped that with the Elex, Focal would have remedied it, but it appears they haven't. Its a very frustrating problem if you listen loudly, or listen to music with a lot of heavy bass content. Its weird as the headphones still play music fine at lower levels, and without heavy bass content, am I right? Mine did. I figured it must have something to do with driver excursion and something loosening over time.