Re: why is my note 5 fast charging not working well sometimes it work some times it dosnt??
Correct. It should be cable issue. A good cable can charge fast.
Make sure you have a good cable. Some cables limit current lower than 1A. Cable core should have 22AWG or 24AWG to support fast-charge though 2.4A or more. A Meenova cable supports fast-charge even on computer port.