On the device Dashboard what is the cnMaestro connection status ?, when the LED is orange are you able to ping to cloud.cambiumnetworks.com?, can you please send techsupport file, please download it when the issue is seen.
Also please check this article in knowledgebase about how to debug onboard issue
http://community.cambiumnetworks.com/t5/cnMaestro/Device-On-boarding/m-p/51484#U51484