I would suggest just go to notification then turn off the app that you dont need it.. dont use.. wallpaper HQ during taking a videos ..dont use vibration ..then restart your phone..
if you want to Roll back the old set up...just go on this website www.samobile.com the create account.its free..after that go to the firmware section and typenon the seacrh your Mobile model..just the download the firmware and Odin..to flash the firm...