I recently upgraded to OS4.0, but after upgrading, the last row of my keyboard isn't working (space, number, enter, etc). The screen works when you're selecting menus an whatnot, but when you touch the bottom of the keyboard, it registers it as a space up (backspace, shift z, etc). it does work though for landscape, but i can't enter any passwords for my wifi. I've tried restoring multiple times, and have also factory reset. anyone know what's going on?