Why is my phone charging slowly?

[AC Question]

My phone has been charging slowly for the last couple of days. Oddly enough, the problem went away once during the two days, but it came back again today. I'm using the original charger that came with the phone. Again, this problem has only been happening for a couple of days.

 

[Laura Knotek]

What device do you have?
Sent from my Nokia Lumia 920 via Tapatalk