These past few weeks my phone has been lagging  a lot.PUBG is very laggy even in the lowest settings.Basic tasks like switching apps and pulling down the notification tray also shows lag.Few apps take longer than usual to load.If I switch an app the ...

The lock screen automatically has a completely black wallpaper after every call.

Bixby keeps turing on automatically since the last update. This is happening without pressing the bixby key or saying  Hi Bixby to wake up. It just covers up the half screen and pauses whatever I'm watching.