Because computers a really good at following instructions. They love following steps. But if something goes wrong and they get off of those steps it’s very hard for them to find their way back into them. But if you force the computer to start over at the beginning, chances are it will complete the steps just find as long as nothing goes wrong.

So turning something on and off again is essentially just saying “hey, you messed something up but you can do this, I’m gonna put you back at the start, try again.”