I know nothing about Captive Works receivers, so I'm not aware of a specific issue for this receiver. But, it sounds like a TP (transponder) overload. Which is when the memory in most receivers can't handle the overload of saving to many TP's. If this is the case, then you can delete as many TP's as needed to free up space in the memory and it should be OK. Just a thought? Good Luck!
Al