Apparently, some Amazon Kindle users that purchased the non-lighted cover along with their reader have been having some issues with the device rebooting and freezing at times after the case was installed. It seems the issue is directly related to the cover in some way.
The lighted cover is not causing any issues with the device. Amazon has not offered an official reason or explanation of why or how the cover might be causing the issues with the Kindle reader. However, the speculation is that the metal hooks on the non-lighted cover are causing problems.
Amazon says it is looking into the problem and will honor returns and exchange request for any users wanting a different cover for their device. The exchanges and refunds will be offered no matter when the cover was purchased.