I did have the Kobo app totally crash on me when I was trying to open a book in the library. It was stuck on the spinning wheel and when I tried the back button, I ended up with a black screen and a nonresponsive unit. I did the 10s reset thing and it powered back up just fine.
I had installed a game and then didn't like how it was rendering on the screen during play, so I uninstalled it. Maybe I should have held off on such a thing until I fully evaluated the effects of the update. I am not as nice to the Vox as I am to my computers when it comes to installing stuff, I'll have to admit.
I had been having a lot of problems with the Vox freezing when coming out of sleep mode, and before the update, the newest thing it was doing was coming out of sleep mode by itself. I would walk into the room, and the Vox would be on. That was happening just before the update became available, actually.
Since the update, I haven't had any problem with coming out of sleep mode. We'll see how it goes today.