I bought a d03 open box from a seller on ebay, and it "skips" briefly while playing music. It does it just often enough to make it a nightmare to listen to. I tried multiple inputs and power supplies, and ran it with and without a preamp. Ive already had my money refunded, as i suspect they knew of the issue when they sold it to me, but im curious if theres any chance it might be something i could fix. I already took it apart and visually inspected all the solder joints and cleaned up the ones that looked a bit shoddy, and it didnt help. Any ideas?