I'm experiencing the same problem as these people,it all started yesterday.I was leisurely lying on my bed reading mag with my XP3 on when suddenly i'm no longer hearing the bass.At first i thought that my music file was corrupted,then when tried with a jazz song(not much bass),the vocal disappeared altogether!!! .I've been using for 1 month only,so to have this problem occur on a supposed Germany-made IEMs is quite disappointing.Need advice,especially from Wallabies.