Charging problem (slow on charger fast on power bank)

[Laburance]

I bought my xperia xz a month ago

At first, my original usb cable start to malfunction. It won't fast charging and doesn't recognized in pc. So I replace it with random type C usb at local store. Yes it works, and it fast charging. Yet after a week, my charger port start to heat. And my phone won't fast charging anymore. Tried it with xz premium original charger it works normal with fast charging. Yet, when I use my charger it turn out slow. 

Tonight I try to charge my phone with power bank and it charge normally. 

Could my charger head (port) the one which broke? That cause my usb cable malfunction? But i use my usb cable with another charger port yet it also malfunction. My port works normal with another usb cable also. I am really confused

Thanks

[Uliwooly]

@Laburance

This is rather odd, you could try a different cable or contact your Local support regarding this

[Laburance]

Right now I am charging with power bank. My usb cable from box work normal before, but not again. Now charging with new usb cable.