It's pretty much expected, these sorts of complex systems follow a bathtub curve. Failures either happen very early or after a very long time. If you design som

It's pretty much expected, these sorts of complex systems follow a bathtub curve. Failures either happen very early or after a very long time. If you design something so that it has a 99% of lasting 1 year, there's pretty good odds that it'll make it to 5 years since the riskiest time is the first weeks/months.