When my phone was newer I had a lot of usb port trouble, overheating, failing to charge properly, even apparent bricking. I heard there was an issue with this port. I narrowed it down by sticking a small object into the USB port and levering the pin slot back up to the middle (preventing the short).
That fixed it for a while. Also fluff can create a short, so blowing it out can fix it.
It finally failed again, so I bought a $5 piece from ebay, watched a youtube video and fixed it properly.
So, try firstly blowing out the usb port, then using a toothpick to push it around a little. If that fixes your phone then all good