I had huge issue with my flexwatt not long ago. My tubs had wore down the flexwatt and I was getting shocked when I touched it! It was making that buzzing noise then too. I took it all off and replaced everything. Just the other day I heard buzzing on one shelf. I have no idea why it was buzzing. It was definitely the flexwatt. I thought maybe something was too tight, moved some things around, and it still buzzed a bit. The next day it wasn't buzzing anymore and it's been almost a month now and it hasn't buzzed since and is working fine
Maybe someone knows why the flexwatt buzzes?
I would also think that keeping it on a metal shelf might not be the best option. I would at least put a layer of plastic or some sort of insulator between the flexwatt and the metal shelf.
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