Until yesterday this unit was exemplary. The driver unit is a Stax SRM 323 S. I've had these phones for a few months and the audio just seemed to get better and better. Today, the right channel audio was much less than the left channel. Also, the audio quality in general has deteriorated. I tried to compensate by turning the right gain higher, but this has resulted in distortion of the right channel. Obviously, this cannot go on. The phones were purchased from PriceJapan so should be under warranty since the purchase date was less than a year ago. I just sent PriceJapan a message. Has anyone here had a similar experience, and what were the results?