I dunno if these are necessarily "driver" issues at this point, but I have two persistent issues with my Book still. One, the connection between the screen and the keyboard seems to be flaky sometimes, tapping on the screen so that it moves a little bit will break the connection, and it takes a second or two to come back. If I disconnect the screen and reconnect it it seems to be solid after that. So it must be somehow jostling loose in my bag, which seems weird, since it's really locked the hell on there.
So yeah that's more hardware I think, but what I'm unsure of is this machine's uncanny ability to bluescreen and turn off when it's not supposed to. Sometimes it will just hang and bluescreen for fun, but most often it'll just lose power after going to sleep. If I let it idle and it goes to sleep, if I come back to it after an hour or two it'll just be powered off entirely. Not even hibernated, just power failure and all things lost. And this is with it plugged in half the time. I've bound my power button to "hibernate" so when at all possible I don't let it go to sleep now, which is kind of a pain in my ass. Often it'll also just not wake up if I close the screen and re-open it, I have to hard-reboot to get it alive again. The whole sleep situation is a complete shitshow.
It's a testament to how great the Book is overall that I don't just throw it at a wall despite all this power crap. It's a bummer tho, I've never had a Surface device that didn't have some sort of fundamental underlying issues like this.