Hello! My name is***** 'm sorry that you're having this problem. I'll do my best to help. This is often the result of a "glitch" in the software. Luckily, it is easily fixed.
Please do the following:
Remove the charger from the Kindle and hold the power button or switch in the OFF position for about 20 seconds.
Release the button or switch, then connect the charger and try to turn on the Kindle.
If this doesn't work, please repeat the steps and this time hold the power button or switch in the off position for a full 40 seconds. This should reset the Kindle to factory defaults. You will know that it successfully reset to factory defaults, if it reset the Kindle back to the way it was when you took it out of the box. Did it do that? If not, please try it again, being sure to hold the power button for a FULL 40 seconds. If it did require you to set it up again, then the factory reset was successful.
If you do have to reset it to factory defaults, you don't have to be concerned about losing your books. The books that you have purchased from your Kindle will continue to be available at the Amazon website under My CONTENT if you should wish to download them again at some point in the future.
If it was not successful (it didn't require you to set it up again), you may be able to a factory reset from www.amazon.com/myk. Go to My Account > Manage you content and Devices and click on the device tab. If it is available, you'll see REMOTE FACTORY RESET as an option in the drop down menu under DEVICE ACTIONS. Please note: The Fire’s battery needs to be charged to at least 30% and it must be connected to a Wi-Fi network. If this doesn't work, or of the option is not available for your Kindle, please let me know.
I am a bit concerned that it is an ongoing issue. It could potentially be a problem with the charger if the reset doesn't work. Please give these suggestions a try, let me know the results, and we will go from there.