@Aws_new Kindly refer to this thread and change router' s 5Ghz channel to 36/40/44/48 with the help from router's support. [Troubleshooting] TP-Link Range Extender is not detecting the 5GHz Signal of...

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This article provides instructions on how to modify the main router’s settings if you are experiencing intermittent wireless connection on the range extender, especially when you have placed the...

@sarpdoruk Thank you for your update