Air Purifier Table emitting high pitched noise
I‘ve got the SwitchBot Air Purifier Table a few days ago and since yesterday I noticed that it‘s emitting a high pitched noise on the lowest fan speed when it‘s on Auto. The noise changed and almost disappears on the higher fan speeds. I know that when first switching it on it was dead silent on the lowest speed. Has anybody experienced this? I don‘t have it in my bedroom but if I did, I would not be able to sleep beside that annoying sound.