Are you saying you HAVE an external amp? Is it NOT theYamaha DSP-A1?
BOTH channels? That would suggest something common to them both, huh?
If it's only present on analog sources I would suspect a bad audio cable or a switch contact somewhere in the signal path. Typically, it might be a switch you rarely use, like a Tape Monitor or Mute. It's wise to occasionally (with power OFF) manipulate all manual controls throughput their ranges a number of times to wipe oxides from their contacts.
The problem may be within the unit, a connection behind the jacks. Bad solder joint maybe.
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