If it is an exposed wire element (like in a dryer)there might have been dust on it but more likely it was a cal-rod element (like in a stove element) that had absorbed a bit of moisture during storage. Once it had a chance to run and dry out for a few days things became OK.
While not a fan of GFI's, they do have a purpose. If you remove one and down the road someone gets hurt you can kiss your butt goodbye....