Quote Originally Posted by oj88 View Post
Is the problem specific to a single physical port, or do you have the same issue in all USB2.0 and/or USB3.0 ports on the same PC?

What USB device or devices are you trying to connect?
Have you tried other USB 2.0 or 3.0 cables?

What I have encountered is that a frequently-used USB port may get worn down to a point where the contacts no longer make a good connection. Usually, unplugging and reinserting the USB device solves it.
Use Windows Device Manager

In the "Device Manager" window, click the + (plus sign) next to Universal Serial Bus controllers. You will see a list of the USB ports installed on your computer.

◦If your USB port name contains "Universal Host", your port is version 1.1.
◦If the port name contains both "Universal Host" and "Enhanced Host", your port is version 2.0.
◦If the port name contains "USB 3.0", your port is version 3.0.

also in the device manager, you can see if the device is working perfectly or has errors.