We were in the high-end of 3.6, moved freqs down to the low end and still had the same error code appear, moved back to original freq and after about an hour all SMs re-connected. Waiting to hear back from Cambium Support in a ticket but we are all but ready to RMA this as soon as we get their blessing.
We RMA’d our unit that had this issue.
We ended up having to RMA the unit.