Consider yourself lucky then, and I hope your luck continues to be good. I had one Kindle that kept resetting itself. I cannot remember which one as I've owned so many, but I think it was the first model after the Kindle Keyboard (K3), the first model which didn't have the built in keyboard. I also had a Sony eReader that would reset often. The worst by far though was the first touchscreen Kobo model, which was a total piece of garbage IMO and reset nearly daily. I think that was due to the almost daily FW updates Kobo was releasing. They had no clue of what they were doing and would make the Kobo Touch worse with each FW update. I actually returned it a week later because it was so bad. BTW, none of my e-Ink readers were ever jailbroken. And having worked a career in the high tech industry, I have had several hardware failures with work computers and a few with my personal computers at home. To assume you will not be plagued by a failure at some point is more wishful thinking than anything. Stuff happens--be prepared for it.

I do understand the allure of having your entire library, are at least a large part of it, on a single, portable device. But honestly, how many books can I read before that device fails or gets traded in for a newer one? If I was doing a lot of research, then I would likely have a lot of documents loaded for reference, though probably on an iPad and not a snails pace Kindle. But as far as pleasure reading, the most I would ever be able read is perhaps a book a day, so if I loaded 8000 books on a device it would take me at least 22 years to read all of them. So I personally prefer to keep the number more manageable, as in a few dozen books at most. That way there is less slow down, less hassle reinstalling, and more time to actually read rather than trying to organize a vast library on a slow device that has very little organization ability. But as I said, YMMV... BTW, I choose to use a cloud library, so I can search my entire library whenever I want a different book loaded. So as long as I have WiFi or cellular connections, I pretty much have access to my entire library without having it clutter up my device.