You could also have a rogue app running and causing the processor to be used heavily, causing it to get hot and take longer to charge..
as others mentioned hard reset and make sure battery is flat and not bulging..
I noticed for the past few days that my phone gets really hot while it's charging. I powered it off to charge and there was a caution and temp icon on the screen. What could be causing it to overheat?
Sent from my SPH-D710 using Android Central Forums