Change your charger get a new one, I had this problem as well. I tried everything turns out it was my charger, I thought it was my port. I bought a new Adaptive Fast Charging plug and a new cable and it charges much much faster. Battery lasts longer ...
Type on YouTube screen recorder for j8 and you will find a video, there are two apk files to download with installs the screen recorder app that Samsung has developed. I have just done it and it works fine.
