Looking for assistant to Aesthetix IO Sig

My Aesthetix IO Sig Phono Stage comes with Volume control and dual power supplies. Today, when I was listen to LP suddenly there was dark silent and no music came from speakers in about one second then the system sound again but I discovered one channel the sound is half less than the other, I certainly sure the problem was coming from the Phono stage becasue I had immediately played the CD and it was normal.
Anyone can help and direct me how to trouble shoot the fault.