Looking at it AnotherJoe the guy even says he doesn't know what the failure rate is for SDD as there will be many people who can't use SDD due to aging tech or thought they may actually need a larger drive or even changed there minds, the actual list is long
After searching through about 10 different websites/Forums there does seem to be SSD failings but no one seems to know why, its possible for system updates that disagree with the SSD or could be another part of the computer which has failed and can no longer boot up (like i have had before)
Another suggestion seems to be heat issues or power spikes which are damaging the SSD, but no one seems to 100%
One quote of one website says "Intel has also published annual failure rates on roughly 800.000 sold SSDs, and from memory I seem to recall it was 0.4x%."
I think SSD can and do fail for reasons still unknown but the actual failure rate isn't that high if you took into account all the other possible reasons, not to mention most SSD are covered be a good guarantee