I experience these issues too, another issue I noticed is that if you plug your phone to PC, and then say no to the file sharing question (so you only plugged it to charge your phone) it's not charging, it says "USB Charging" in the notification center, but doesn't give you an ETA, no charging icon on battery.
To address this, you have to allow file sharing between your computer and phone. Then, notification center shows you an estimated time of charge and it's actually charging. So I have this and the black screen issue, anyone knows how long it takes until Samsung actually pushes a fix update?
