Sometimes the kindle app does that, clearing the cache, data and force stopping the app; then doing a hard boot always works for me. CS instructed me to do this when I got the first Kindle Fire and it's worked on all the Kindle HD, and Kindle HDX.
Don't know why sometimes the app acts up but clearing the cache and data, then force stopping and a hard reboot does the trick every time.
I'd use another reader app if I had to do a factory reboot everytime this happened.
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