Tetratopia, all and all, is a pretty good place to live. The median Tetratopian would probably disagree with the claim that it's perfect, but they would generally grudgingly agree that it's at least better than the ancestral environment. They have a global supply chain network, free public services, and professional healthcare services. Tetratopians care about each other, after all. Tetratopians don't want each other to die.
But there are some health issues that are both too rare and too expensive (both in terms of finances, and in terms of personal inconvenience) to monitor and prevent. Every solar-rotation, about 6 in every 100,000 Tetratopians have a ruptured brain aneurysm. Of these, about 80% will survive (they will, however, likely suffer some amount of permanent brain damage). Even if you don't, Modernity will find and cryopreserve you.
But if, for example, you happened to live alone, and not wear one of the standard non-intrusive heartbeat monitors meant to prevent exactly this kind of situation, and either didn't have friends who would worry if you suddenly disappeared from the textnets for inexplicable reasons or signaled a strong disendorsement of your friends acting on such a worry, and you had a brain aneurysm slowly develop, undetected, until one day it ruptured in your sleep, well.
You might not be found until it was too late.
But of course, that's very unlikely to happen. Convenience is great and a 0.7/100,000 is so little.
(and 288 heartbeats later, his soul was lost).