USB previously working not recognized

Hi everybody, I read the topics in the forum, but I did not found something that suits my needs, so I start a new thread. I'm running a Windows 7 Enterprise 64bit on a nHP EliteBook 8470p laptop, and I'm experiencing a strange issue. Connecting a USB device to the port, it works properly for some time. At a certain moment, while it is still plugged, I get an error of USB malfunction (code...