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I will throw this one into the mix just in case its relevant. I worked with USB a lot when working as a software engineer on the UK/US chipped passports. The devices that read the chips on the production lines were USB attached and we had problems with the readers loosing connections to the PC running the software checking the chips.
Two things we found were as follows:
1) Quite a few machines (laptops especially) were incapable of providing the correct power to keep the device running and the only way to guarantee a smooth, non fluctuating power feed was to use powered hubs. That in itself caused a problem as you had to make sure the powered hubs were fully 2.0 USB compliant, a lot of them are 1.0 hubs cheaply modified to support 2.0 that did not fully match the spec nor the required power levels.
2) Windows has settings in the Power Management functions to turn off what it considers idle hubs. If you look in Device Manager and right click on Generic USB Hub or USB Root Hub (anything that has Hub on the end, there are some strange ones!!), and select Properties, you will see a tab labelled Power Management. Click on this and you may find that "Allow the computer to turn of this device to save power" has a tick against it. Untick it and Windows will not arbitarily turn of your USB device when it enters the Power Management functions.
I made sure I did both of these when I attached my Weather Station last April, and to date (crossed fingers, touch wood) I have not had one single disconnection or lockup.
