Mine does occasionally crash / freeze, but it's because of a known issue:

http://www.amazon.co.uk/forum/kindle/Tx348MMDYTQ4AFC?_encodi...

I've just been too lazy to change the cover, and it's not been overly inconvenient yet. Amazon, to their credit, offers a refund. Perhaps this blogger is using a non-lit cover and is unaware of the issues with it?