And I don't know what's causing it. I would remove it to give it a good clean but I have read that they retain charge so don't want to electrocute myself. Any ideas, short of replacing it? 
Just to add it sounds a bit like a vibration but it could also being electrical hum so I am unsure. My main concern is safety, i.e is it going to go pop on me.

Just to add it sounds a bit like a vibration but it could also being electrical hum so I am unsure. My main concern is safety, i.e is it going to go pop on me.
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