Charging got slower

Hey,

Any ideas why phone charging can get slower ?
Using original 5V 2A charger, phone updated to Android 6.0.
It is charging around 5% per 10 mintes, but should be charging by 50% in 30 minutes. :confused:
Also I can not find setting for fast charging ... maybe it is gone after phone update ? :confused:

Thanks,
Janis