I switched from Kindle to Kobo and out of the box it would hard-crash within a few minutes of using it, every single time. You have to pry the case off and remove the internal battery hard reboot it. I sent it in, waited 2 months for a replacement, and the new one (with new firmware) does the exact same thing.

I despise Amazon as a brand but nothing comes close to the kindle hardware wise. Waterproof, indestructible, and never had it crash.