Problem with the usb port

The phone one day stopped charging, when i plug the charger it doesn't seem to recognize it, but when it is turned off and i plug it it starts charging but really slow (3 hours= 10%) and if i unplug it afterwards the screen still shows as if it is charging, if i turn the phone on while plugged in the phone says it is charging but again, really slow, if i use the phone while it is "charging" it discharges and when i unplug it, it still shows as if it is charging, NOW if i turn the phone on while unplugged it doesn't recognize the charger, also, i have tried to plug it to the PC but the PC doesn't recognize it either, the PC did play the sound of something being plugged when i entered in boot mode in the phone, i have already flashed another ROM and installed a different kernel, it doesn't seem to work, i have also disassembled the USB port (which is very easy on this phone) and nothing... Do you think it is a hardware problem? or more like a software bug/problem?

Please help, Im kinda new to XDA so sorry if i have problems with the redaction of the problem im having.