If you're talking about the 737MAX, there's no evidence to show that plane is unreliable at all. It will very reliably crash shortly after takeoff if there's a

If you're talking about the 737MAX, there's no evidence to show that plane is unreliable at all. It will very reliably crash shortly after takeoff if there's a problem with the single sensor that controls the MCAS. The problem isn't reliability, it's a fundamental design flaw (the engines being too big for the obsolete airframe design) that was bandaged with a fundamentally flawed software hack that was specifically designed to not have any redundancy and to fail easily.