Mine Couldn't fast charge anymore too.
I made an update Just yesterday, (I was thinking that may be the cause *Shrugs*)
I am using the Adaptive charger provided by Azus. And had tried different cables too.
I have rebooted my device, and even Let it charged while power is off overnight. everything seemed not working. Normally It takes 1 hour before it get fully charge, now, 10 hours?! That sucks!