I do not know if it's a problem or it does it automatically. this morning I noticed that with the charger was charging normally (no fast charge) and then out of curiosity in the work with the battery with something more than 50% I plugged in and again that does not load quickly. I have tried with another original charger the same, nothing fast charging.
I have entered the options where quick charge is selected "yes \ no" in position of "if (activated)" when plugging the charger it deactivates automatically.
It is not very strange, I do not know if it is normal and sansumg automatically decides that today nothing is fast loading or happening. Because I already tell you that I have two original chargers and it happens to me with both ... Very strange