1) Low Battery on Device – The very first common reason why kindle paperwhite freeze is low bettery on your device. Kindle works on high power or consume more power to work smoothly. If you device has low battery then there might be changes that it will be frozen.
2) Multiple Processes running in Device- Another reason might be slowing down or freezing your kindle paperwhite if you have been running number of application in background or in similar time.
Also there are high chances that operating system performing multi-threaded operations at the same time.
3) Downloaded Corrupted ebook – Sometime without knowing, you may download the corrupted files or ebook. Operating system does not load it properly and freeze it unexpectedly
When using the kindle for a longer period of time, you may experience a kindle frozen screen. There are many reasons why that might have been happening.
To know more about kindle frozen screen, visit Etalktech