That's a strange one to me. Do you have the work logs of what exactly has been done in the process of warranty repairs? Are there any blown fuses perhaps? If it's still under warranty, talk with Mike to see if they can get an authorization to change out the scooter for replacement. Can you give better details of when the dash goes out? Does this happen when riding, stopped, accelerating, braking? When this happens, are there any fuses that need to be replaced, or is it just shot until the converter is replaced? To me this sounds like a bad wire harness somewhere, but I'm no expert on the topic.