Out of interest, could you tell me the version of system firmware on the problem photons? Determining the version of system firmware on a Photon/P1
In the initial factory run there was a key generation bug that would affect a small percentage of photons which was fixed in 0.4.8 - if this is that same bug, you certainly were unlucky to be bitten 3 times! 
But please bear with us - it’s not a permanent problem and we can get you up and running with these 3 units.