This could be caused by the computer turning of your USB devices to save power.
To change the power settings on your windows machine follow these steps:
- Go to your Control Panel > System > Hardware tab > and click on the "Device Manager" button
- In the Device Manager window, find the item or items labeled "Universal Serial Bus controllers." Open it, and double-click the first item called "USB Root Hub"
- In the USB Root Hub Properties dialog, click on the "Power Management" tab
- "Allow the computer to turn off this device to save power" is checked by default. Uncheck this box, and click "OK"
If this does not help, contact the support