started functioning really slowly. I'm confused why one day it was fine, and the next the speeds went down dramatically. My wired internet connection is fine, any other device that uses the wireless behaves normally. I'm on channel 1 so I'm pretty sure there are no interrupting signals; maybe it's a fault with the USB? If so, what and why?
If that is the only wireless device that is being slow it's more than likely that adapter. I would suggest uninstalling it and reinstalling. If you are still experiencing the same slow connection speed you could test it in another computer to verify the usb adapter as the problem.