I've been fooling around with personal computers since 1980. Sometimes folks ask me why they get so balky and have to be restarted to fix them. I tell them the story about Model T Fords, which had their gas tanks in the cowl, above the carburetor, and used gravity to feed the gas -- no fuel pump. They'd go anywhere with a full tank. But, sometimes, with 1/4 tank or less, going up a hill that was just steep enough, the gas level would be below the carburetor, and the thing would quit.
Now, if you didn't know what was wrong, you might walk back to town, or maybe find a farmer to pull you to the top of the hill. The clever folks, on the other hand, would roll back down the hill a little, and make a 3-point turn, so they were facing downhill. Now, the gas was above the carburetor, and they could back up the hill to the top.
That's what today's computers are like. Sometimes we just have to back them up the hill to make them work right.