Many times, I've tried to download my profile onto a console that already has the profile downloaded on it, but get an error message starting with 800 that says "Sorry, some profiles can't be downloaded right now."
This problem is solved every time by disconnecting and reconnecting the power supply. It can also be solved by doing the same with the hard drive.
This seems like a solvable problem. Maybe the next dashboard update can reconfigure the system BIOS to clip the power supply on shutdown.