Got my note last saturday.. seemed that I got same issue like you after the update.. and finally resolved after some try n errors when I found that my case was the true culprit.. wrong back flip caused it auto off (screen) and when u manually on it the touch screen could not responsed to your finger, but no issue by using the s pen.. so I hv to makesure the foldeble edge (where the magnets placed in the case) sit at the left backside of the tab or it will auto off again.. the rest issues still unnoticable n here me another happy owner..