Do you notice a red light flashing on the button that manually raises and lowers the wing? This light should come on the very first time you go over 62 mph to warn you that your wing is malfunctioning, and continue "blinking" until you turn the car off. If it isn't coming on when it should, maybe this could give a "trained" Crossfire Tech some idea where the problem is. Or at least help them to narrow down the possibilities.
Obviously it isn't something as easy as replacing a fuse, since you can raise and lower it manually.
There are 25 pages in the service manual under "BODY-Electrical Diagnostics" dedicated just to spoiler malfuctions. So I really couldn't begin to tell you where to start.
Actually, some people would be happy if their spoiler didn't go up unless they wanted it to. I even installed a "kill" switch to deactivate my wing just to keep it down until I felt the time was right to put it up.
Good Luck, and by the way, welcome to the forum.
Mike