Samsung Galaxy On7: Video lag

I have a Samsung Galaxy On7 with Android 5.1.1. The phone has a bug that makes video apps like YouTube, NetFlix, Facebook (and others) lag in the videos. Almost every video opened lags in the first 7 seconds, the same happens when the video time is advanced or retracted. I've searched a lot but I didn't found any solution for this problem. I wonder if there is any way to fix this error (even with root).
(Sorry if bad English)

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