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I am sorry to hear that you are having this issue.
try this on your Kindle>press and hold the power button for 20 seconds and then release. .Then remove the existing wireless networks from the list. Tap the Quick Settings symbol in the top right hand corner of the Home screen.2. Select Wi-Fi from the menu.3. Ensure Wireless Networking switch is in the on position.A list of networks will appear. You may have to wait a moment as your Kindledetects networks in range. If your network doesn't appear tap the tick box next toWireless Networking off and on to refresh the list.4. Tap the name of each of the networks to forget. On the screen prompting you toenter a password, select Forget.
Then try connecting to wifi again.