So I use the charger that came with the phone but whenever I plug it in it says it's slow charging . I have to unplug it a bunch of times for it to fast charge.it's very frustrating
Mine too. I've had the Samsung Galaxy Edge since May and after a month it started slow charging all the time. I have to repeatdly disconnect and try to connect it again before it recognizes the fast charging method. Some days no luck at all.
Check to see if you have fast charging option turned on