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I see your vehicle is still under warrantee , did you have it to the dealer .Given the amount of computers on your vehicle it could be a glitch in anyone . These electronic systems are all intertwined together ,sharing information on serial data communication networks .GMLAN is a variation of CAN - controller area network . How to Diagnose Controller Area Network CAN The first thing to do would be to hook up a factory scan tool an check that all modules communicate , check for DTC'S - diagnostic trouble codes . Check all connections ,power an grounds , voltage drop test starting , charging systems . Look at the wiring harness in the engine compartment for routing an rubbing on body etc... These type of intermittent problems are not recommended for a DIY'er .
You need to have an analyzer connected to show any codes. It sounds like and ignition system problem; however, if something is causing the fuel mixture to be too rich, it could be flooded. Your owner's manual should have procedures for difficult starting problems. If none of those work, you will need service.
Generally speaking, if the security light is on and the engine will not crank, the VATS system is not reading the chip in the key. Either the chip has failed, or the sensor in the lock cylinder, or the VATS module. You could try a spare key but most times you have to have a shop make the repairs.
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