Guess I was lucky, we ran a lot of these over the decades when things were far more unreliable than now and never experienced anything like that. Manufacturing issues, sure, but we always had everything we bought run on stress for 48 hours and see if that killed it, if it didn't, it didn't usually break anymore (I have many of the machines from mid to end 2000s still and they don't have diskfailures now while they ran for many years).