I never had any problems with my three wireless routers over the last year.
Ok, they are manufactured for the EU-market, not for the US, but I doubt this as anything to do with it.

Are there other wireless routers in the neighborhood that might infer with his?
In the beginning I had some problems like that when I was operating them on a channel close to the channel of my WLAN Internet connection.

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"Who does not know anything, must believe everything."
Baroness Marie von Ebner-Eschenbach 1830-1916