when i plug the explore into a usb port to charge it or sync it it goes off on its own ride. Now it does not physically move but it travels some 2 miles recording its trip as it goes. I then have to delete the recorded trip before I go out on a ride. It does this every time it is connected to the usb port. Is this bt design of is it a flaw in the firm ware or software. Please stop this happening it is very annoying