Fast Charging slower than normal cable charging.

[Eliott]

I am having this problem for almost 3 weeks. When the phone is charging with Fast Charging option on, it takes at least 5 Hours to charge M20. Sometimes it doesn't charge at all. But in Cable mode it takes 2/2.30 hours. I had this problem before, but it was fixed automatically after 2/3 days. And as for your concern, I changed the cable. It didn't work. I wiped my cache partition too. And Restart too. 

[lucky1119]

for 1 and half months only bro.i think ur mobile is new after fast charge will fast

[Eliott]

Bro didn't I mention that I have checked with new cable? It doesn't work. I have bought 3 new cables, even adapter. The result is same.

[Samsung_Support3]

Dear Samsung Member,

Greetings from Samsung Customer Support!

Please visit this mentioned link to resolve your charging related issue: https://www.samsung.com/in/support/mobile-devices/battery-not-charged-charging-related-issue/#:~:tex...

For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support