It’s a problem caused by the Reloop Buddy. As soon as the iPad is getting close to be fully charged, the noise will appear. Reloop is aware of this issue since quite a long time but still didn’t offer a solution or a firmware update yet. It doesn’t happen if I use my iPad Pro connected with a USB-C to USB-B cable and put the little switch on the side to PC instead of iOS. To be able to charge the iPad I use a USB-C hub
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