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I am sorry you are having this concern, I will do my best to help you today.
To answer your question ->
That means that there is electromagnetic or radio frequency interference on the power line. In this case, put the devolo Magic adapters closer to each other or try to shut off the source of interference to fix this. More info at https://images-eu.ssl-images-amazon.com/images/I/A19-tsYW3LS.pdf on Page 14
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