Cambium Free Radius troubles?

Not sure if this is a story and also not sure if this is the correct place to place this issue.  That being said we need some help with the proper setup of Free Radius for our PMP450's and EPMP1000's.

We did get Free Radius loaded and basic configs set and a few PMP 450. 430's loaded.  Just recently the SM's have been dropping like flys and we cannot get them to re-authenticate.  Can someone help me understand why this happened as we are sure that nothing has changed in the network.