We have had over 12 units fail with water ingress , this is a know issue and cambium has made changes to the constrution of the Medusa 5ghz AP. We put weep holes in the blank caps to let water out, Long story short after a year of testing the issue we have determind tha extream tempetuer swings allowed water to enter the unit and not let water out untill the PoE side shorted out and fried the port. Also note the CMM5 will not shut power off to a port when a short happens , guranteing a burnt out port.