I am trying to figure out how and why Flash software cards go defective and just quit working. I have 3 of the 2.0 that I can not get to work. Are these repairable, and if so, where can I send them to get fixed?

The flash s/w its just a weak s/w and can get corrupted very easy ,a small spike or interruption in power source the s/w goes bad.Thats why they recommend a UPS all the flash VM,about repairing it depends if its corrupted s/w it could be reprogrammed or reload the s/w but if the Flash card went bad ,then its not repairable .I will suggest contacting SUNDANCE if they do that service ,and if not email me I can help with most likely all s/w.