weird humming sound

Hey guys I keep getting a humming sound whenever I turn my axe fx 3 on. does anyone get this and know what it is?
sometimes it doesnt happen as soon as I turn it on but maybe after 5 minutes playing around with axe edit III it will come on.

its sitting on a plastic case with my audio interface (RME UCX ) directly sitting on top of it. below is a photo.
Im in australia I hope its not a power supply thing since our electrical mains are slightly diff to the ones in the states.
 

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