I have a TomTom GO 500 GPS unit and I seem to have come across a very peculiar problem. Recently bought a Surface 3 Pro. When I start downloading updates through MyDrive I keep getting a message stating to make sure my TomTom unit is connected about 5 seconds after the download begins. If I unplug and reconnect the USB cable to my TomTom GPS unit then MyDrive will resume downloading updates and disconnect after about 5 seconds. I'm using the USB cable supplied by TomTom in the box. This also happened on my Late 2013 Macbook Pro if I did updates with Windows 8.1 Pro. I did not experience any connectivity problems under Mac OS X Yosemite. I have an older HP laptop with an Intel ICH7 chipset running Windows 8.1 Pro. I experienced the same connectivity issues regardless of whether I was using the laptop's USB 3 or USB 2.0 ports. Is there some sort of issue in Windows 8.1 that's causing connectivity issues with MyDrive and the TomTom GO 500?