I have checked to make sure the drivers are up to date and they are, but for the past two days the keyboard (which is a USB keyboard) will randomly stop responding. Changing USB ports does not help the issue.
Have you connected any other USB devices that could be draining power? Try to disconnect everything but your mouse and keyboard and see if the problem comes back, if this rectifies the issue get a powered USB hub to connect the rest of your devices.
Also check that the USB bandwidth and power level limits are not being exceeded, I have attached a picture
Nope, nothing else is connected via USB apart from the keyboard and mouse, and the USB bandwidth looks just like your pic, but with 5 ports available. Thank you, though.
Do you have just a bog standart keyboard or one of the lightup / gamers ones?
It's a standard keyboard.
Then it can only be one of 3 things. (1) keyboard is faulty - try another one.... (2) power is dropping out on usb - does the num, caps and scroll lock lights work when your keyboard dies? (3) OS issue, your may need a repair install or a fresh install of your operating system. It must be noted though if your USB ports are dropping power then this indicates a serious issue with your motherboard (check voltages in bios, some bios's have a voltage monitor. Look at the 5v supply)
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