Hi,
Thanks for checking that.
I am not sure what else to suggest. A hardware fault seems unlikely, because I’m sure we fully test the USB interface while we are configuring the board with the OLA firmware. But maybe it is a bad joint on the CH340 (the small chip on the bottom of the board, directly under the USB connector), or under the Artemis itself.
If no one else replies in the next 24 hours, please start a return at https://www.sparkfun.com/returns or through your local supplier.
Apologies for the inconvenience,
Paul