Have you enabled b/g/n on the 2.4Ghz band rather than just g/n it defaults to?
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Hey there Senscall and sorry to hear about the smart plugs issue you're having.
I'm unable to advise on the third party smart plugs but I've had a quick peek at your network details and can confirm that everything is okay at our end. If you have any issues with your connection without the third party smart plugs, do let us know so we can help.