Fix USB Device Not Recognized Problem After The PC Is Idle For More Than A Hour In Windows 7
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You might be facing the problem in which Windows 7 doesn’t show the USB device connected to your PC after your computer is idle for more than one hour. This is a known issue and Microsoft has confirmed this problem. There is an update available for fixing this issue. When the problem occurs, the USB device is not displayed in Device Manager too.
This problem is seen in all editions of Windows 7 and Windows Server 2008 R2. Download the update from below link and install it if you are facing this problem.