Hi Mark
I had a similar problem recently with my CSMIO/A which suspect was caused by the 24V input voltage. My machine (Morbidelli Author 504) used a three phase half wave rectifier to produce "24V", ie it wasn't regulated, so would peak to well over 24V, possibly to close to the 30V max.
I wound up sending the controller back to CS-Labs in Poland for repair, which they turned around quickly and at no cost. Meanwhile I installed a 24V DC switchmode supply in the machine to provide true regulated 24V DC.
When the controller came back it worked first time.
Hope that helps.
regards,
Andrew