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Ok I need a little more info. First does your G have Intelligent key? If not do you have anything els on the key ring? Like a Mobil speed pass, or an other cars key? Third, When this happens does the security light stay on? This would definitely indicate a NATS malfunction.
Did they say which NATS code they got? That information would be helpful.
The key doesn't have a visable chip, but the plastic housing has a small rectangular panel that may house one. We have other keys on the ring but no car keys. There may be a Mobil speedpass on that key chain as well. The last time it occured was Friday and my wife said that the security light was not illuminated at the time. I just had a tech scan the system and there was a PO 1615 code stored. He cleared that code. Thanks,