My USB keyboard does not work. HELP please

I have had four (4) different USB keyboards plugged into my Dell Inspiron 5520 64-bit laptop and all of them eventually stopped working within days. The keyboard will type a few days and then stop working. if I unplug the USB laptop it freezes the computer and I have to hold the power button to restart the computer. Once the computer is back on I can plug the keyboard back in and it will type a word or few then stop working. As long as the USB keyboard is plugged into the port the computer works fine, it does not freezes until I unplug the USB from the port.... I also have a USB mouse which works fine. I have plugged USB mouse into the same USB port where the keyboard was plugged into and I have NO problems. When I unplug the USB mouse nothing happens the computer remains operational. I JUST NEED FOR THE USB KEYBOARD TO WORK ALL OF THE TIME AND WITHOUT FREEZING THE COMPUTER WHEN UNPLUGGED. Simple enough I know but I have been dealing with this problem for going on three (3) weeks now. PLEASE HELP. Thank you in advance.