As these problems are fixed, the failure rate of the hardware products drops. However, as hardware ages, physical deterioration causes it to fail. In other words, the hardware wears out and the failure rate rises. Software, on the other hand, is not subject to the same wear and tear that hardware is. There are no environmental factors that cause software to break.
Software is a set of instructions, or a recipe, for a piece of hardware to follow.
There are no moving parts in software. There is nothing that can physically deteriorate. Software should never wear out. Unfortunately, it does. Countless authors in the field of software engineering have identified this problem.