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I had a similar problem some time ago. For me, the solution was to change the router settings for the 2.4GHz network to use a static channel instead of Auto. I chose 9 because an app I downloaded showed it was the least congested one in my neighborhood, and some online research suggested that older kindles can't connect to higher channels. That worked so I never tried anything else, but my next step was going to be using separate SSIDs for the 2.4GHz and 5GHz networks.
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