Are you using the original Samsung charger that came with the tab?
I have a Samsung Tab Pro SM-T325 and its 1 year old. I am having a problem with the charging of of my tab. When i put my tab for charging i noticed that the charging is very very slow. If I put my tab at night for charging, I find that the tab is not charged 100% in the morning. Why does this happen and how do I rectify this issue? Please help.