Maybe it could be related also with usb port which You use. In manual they said that port used during initial connection has to be used as only one for future use with CC121. I didnt noticed any difference when different port used, but who knows. 
Maybe it could be related also with usb port which You use. In manual they said that port used during initial connection has to be used as only one for future use with CC121. I didnt noticed any difference when different port used, but who knows.