well go to settings and the search for fast charging after that in the end you'll see fast charging enable option. Enable it. and use original charger and cable only then the charger will give its best.
My a50 is heating abnormally.. Even while taking snaps in camera for few minutes or surfing through internet or even when not in use in pocket. it's always warm. I am not using any bloatware apps or not switched on internet always. My device heats even Moderate usage !! Done Reset, up to date software!! But no use... please help !!