Issue With SN3 When Changing Inputs. Loud Noise From Speakers

Yesterday when I changed inputs on my SN3, with the volume on zero, there were loud thumps from my speakers.
I powered the SN3 and the Hi cap down and unplugged the power lead from the back of the SN3. After a few minutes I plugged the power lead back in and switched it all back on and now there were no thumps when changing inputs.
Does anybody have any idea why it would randomly do this?
Thank you.

I get this with my SN3.

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