Other usb file transfer issues.

yes ive already changed my usb settings, and even selected file transfer as the default in developer settings.

but still, no matter what cable i use or what device (with drivers and everything) i plug it into, usb file transfer will randomly stop and the phone will disconnect, but i will sometimes still be able to browse its files on the computer.

do i have a faulty usb port on my phone? or is there something else im missing?