Memory gets corrupted. Harddisks at least would slowly die over time because sectors of the disk would stop working and have to be marked bad. I’m pretty sure w

Memory gets corrupted. Harddisks at least would slowly die over time because sectors of the disk would stop working and have to be marked bad. I’m pretty sure with most things the data you read back from memory is a random variable (one with a very very low variance but it’s still random at the end of the day.)