If you can do a factory reset of your Kindle, try performing that also. You problem is likely not widespread as there are no complaints like this on the various forums I monitor that cover issues with FiOS Internet. My neighbor (who has a Kindle Fire and FiOS Internet) has no issue like yours.

Fix Kindle HD WIFI problem!! EASY!! - YouTube Dec 28, 2013 Fire HD 10 Keeps Dropping Wifi : kindlefire Sep 28, 2011 Amazon Kindle Fire owners reporting Wi-Fi bug - CNET Some Kindle Fire users are complaining of Wi-Fi and Internet access issues. Amazon Just three weeks after the debut of the Kindle Fire, some users are complaining of problems accessing Wi-Fi Kindle Fire Email Cannot Connect to Server | HowTo

Common Kindle Fire Problems and How to Fix Them

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How to Soft Reset or Hard Reset Kindle Fire Tablet

IPad & Kindle Fire connection problems ‎01-02-2012 08:07 AM. Message 1 of 6 (2,017 Views) Have new Ipad and kindle fire that will not connect to internet. Both connect to wireless but when we try to go on line they will not connect. We have an old Westell 327W DSL router. Could this be the problem. Kindle fire email problems - Microsoft® Community Kindle fire email problems I have been having problems with my kindle fire email for months, it keeps telling me there is a problem with my email address or password there definitely isn't and now it's finally saying I don't have permission to access the server.