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Double Bass Humming on jack input in the house

Hi all,
I bought this a few months ago: https://www.amazon.co.uk/amPlug2-AP...952246668-B00NAUKJTY-&hvexpln=74&gad_source=1

It was working fine. But now when I plug it in I get really bad humming!! However, if I walk to other parts of the house - or most notably outside in the garden - it gets better, with no hum!

So its obvious theres some intereference somewhere. Ive unplugged and turned off every electrical in my office (which is where I usually play bass) but still the humming!! I walk outside - its fine!!

How can I diagnose this further? Tiurn off the mains power to the house? (joking)

Thanks