go to windows control panel, device manager
go to the menu item and select show hidden devices.
look at the list for greyed out devices and removed them.
generally, you will see this happen on a PC when an apple device is trying to charge off of a PC usb port. Apple devices use a usb connector but draw 4 times the max power from a PC usb port. This makes the USB port think there is a short circuit so the port shuts down until the power draw goes down. (now you get the sound of the disconnect) the power draw goes down, plug and play runs and finds the port and turns it back on a second later, it reconnects to the device and makes the reconnect sound. then the device takes too much power and the cycle repeats. this can also happen if a usb port is shorted out against a case.
generally for apple devices you have to run a special apple charger usb driver to override the shutdown of the port. some pc vendors make certain color coded USB connections specifically for apple devices. if you have one, and charge a apple device you should use it. I think my version has red plastic rather than blue plastic in the port.
if you don't have an apple device or something else charging you have to look for a bad connection on a port. short against a case or i have seen people plug in a USB header cable into the motherboard and force the cable onto the wrong pins and get this problem. older versions of windows did not detect the problem and give you a sound warning. your port would connect and disconnect over and over and your system would run slow. people rarely figured it out.
check for the charging device first. let me know if you do not have one.
second show the hidden usb devices and remove them. USB hides the device driver when a device is unplugged. The hidden driver still functions and can mess up stuff on the ports.
next thing to look at would be a miss matched bios version and usb drivers.
but start with the charging device first.
also, on some motherboards usb port 9 might be a special port that plugs in another hub so you get more usb ports. I had one motherboard that did this and that port always had a error. but do check the motherboard usb header connections for correct connection. make sure pin one is on pin 1 on the header.
I have see people plug in the header and miss the first set. IE they used 2 pins from the second usb header on cable header 1
guess you could also get this if collectively the connections on the entire hub connected to port 9 drew too much power. Then the hub would cycle in shutdowns and startups.
i generally use this tool to look at these issues if I don't have a debugger.
USB Device Tree Viewer (uwe-sieber.de)
bad usb connections can thermally expand and contract with use and cause intermittent connections. (I have seen this with drive connections)