Disturbing noise in operation Stanby

This thing sends a high-pitched tone of a makes insane in standby mode. You Googled for this problem you will quickly find that this seems to be a general problem with this series probably (unfortunately I have not previously made ...). Switching off the indicator lights on the Devolo Cockpit has unfortunately brought no improvement. Especially great is the warranty of Devolo. First of all you have to send the unit at their own expense, for inspection purposes. In the surly support email you will also once pointed out what one has to do everything, because otherwise the device is disposed of after 28 days at Devolo !!!!!! As I say but smooth, Devlolo not coming into my house. High prices, outrageous customer service, and most recently probably also poor quality.