Have you made sure none of the cables at the rear of the stereo are touching, as I have had this in the past on my XB80AV, I found that it was making a relay click, but only when turning it up, the music appeared to be jumping but it was actually just blanking the sound while the relay sorted itself.
I hope this helps, if you haven't already sorted it.
James
April 2005
have you got your speakers next to the unit ?
moving them will reduce vibration which could be the problem
paul
January 2005
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