Hi. I'm connecting my Garmin Edge 830 to my laptop by USB cable for uploading courses. I've been doing this for about 2 months with no issue - ie, Garmin shows in File Manager; drag GPX files into NewFiles, eject Garmin from Windows - bingo! Now all of a sudden the Garmin is not showing up in File Manager (laptop or desktop). I've tried rebooting / resetting a number of times but to no avail. It's so frustrating! Has anyone else had this issue and know how to fix it? Thanks for any help!