I have just received my two new spark cores, one with a chip antenna, the other with uFL. The uFL one connects fine first time to my home and work WIFI, but the chip one will not go past the green flashing light connecting to WIFI network stage, even with the core held right next to the router. I have tried all the suggestions I can find, including connecting over usb, but no success. On my work WIFI at least I do not have access to the router to change channel etc, but as the uFL works I would presume they are fine. Could I have a faulty chip antenna? does anyone have any other suggestions?