Here's a copy paste of one of the timely responses I received from Outlaw. I even called and talked to someone else later as well. Nice people there.
EDIT: I added the first response as well.
"Unfortunately, what you are describing
could not be the power amp. The operation of the power amp is to simply
increase the AC signal present at the input. When a specific problem
happens, such as you are describing, it would be related to the unit
doing the processing. For example, if the Model 5000 had an issue,
because the inputs are always live/active when the unit is powered on,
you would experience this problem all the time not just when
"No worries, we welcome questions. What you are describing is switching
noise either in the playback device or the processor; it wouldn't be
your interconnect cables. If this happens with multiple source devices
such as a player and a cable/sat-top box, I would suspect the processor.
Essentially, the Model 5000 is amplifying this noise."