Black screen

I was one of the unlucky ones to get the infamous black screen on my switch. I hard rebooted it and everything seems to work fine now. Im curious what causes it. It was just sitting by itself and when I rebooted it was at 64% battery. There's so many fixes online and even Nintendo acknowledges its an issue.. but no info on what causes it. Id like to avoid it if i can in the future. Im guessing my operating system froze. Should I wipe cache in the settings? Or just leave it alone.