which switchblade key did you get? There are several kinds out there. The one I had, had everything in it and only needed it to be cut. There is another kind where you transfer over the fob and pats chip?
If the fobs that are forgetting the programming are old i would replace the battery, and then reprogram all 3 at the same time.
ZETEC Crew #26 SR #20 YELLOW BLAZE OWNERS GROUP#4
Moderator Pilot, 12 SE HB ╠╬╝, 2011 Ford Edge SEL AWD