I have old tolino 2011 and when i put my ear right next to the device(only in this matter otherwise it's really not audible) i encounter probably the same noises as you mentioned. Really Weird. Maybe it's the eink Screen mechanism? It sounds like a super low pitch speaker turning on/off but this device doesn't have one . To be honest i wish i didn't learn about this considering i have OCD and it's the latest pointless thing i will obsess about.
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