I had a similar problem strand me on my third day of ownership. I concluded that it was my Mobil Speedpass transponder interfering with the immobilizer system. See this service bulletin for details.
After separating my Speedpass from my keys, I have been trouble-free for 4 months now.
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2004 Red Brawn/Graphite
King Cab, LE, 4WD, Big Tow
Truxedo Low Profile (Utilitrac), Magnaflow 5x11 Polished Muffler
OEM XM receiver, Infinti QX56 Center Console Armrest
Born 8/24/04, Delivered 9/8/04
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