bro once factory reset your device...it helps to crear few glitch not completely.... if then also problem will be there then please flash last firmware from service center..your problem will be solved .... see samsung provides non A/B partition type ota not like other company hence if someone simply updated the samsung provided software via mobile data or wifi and if bychance software not installed correctly then there will be the chance to produce software loop hole formations which creates thousands of issues in device like ui lag ,fast battery drain, battery drain without use device poor camera performance, heat during game etc ...
