Not to scare you, but I work computer repair and I have seen machines newer then haswell have issues with "sleep wake"
The issue can really be seen in windows 10/8 - when you put the machine to sleep, then wake the machine it will have a pixelated screen and mouse. This is caused by failed parts of cache on the CPU AFAIK.
Not sure if macos vs windows would make a difference if a system has this problem, but if you try installing Linux (we've tried ubuntu only) it'll also have this sleep wake issue, but in weird ways vs windows. With windows its very obvious.
Search google "pixelated screen after sleep" for examples of this.