I just checked the air pressure this evening, after letting the car cool down for a few hours. I have 31 PSI in both the fronts and 33 PSI in both of the rear tires
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FWIW, I had the same symtoms, however I don't have any ignition issues. You don't mention the year of your Crossfire, but if it is an '04 or '05 regardless of mileage, you can expect sensors to start failing as the batteries in them will start losing voltage, messing up the TPMS system with false warnings. You don't mention if your TPMS (low pressure) lamp is on. If so, you have the
exact symptoms as I had. Replacing my sensors with new fixed the problem. BTW I was not reading any codes at the time when using a OBDII reader.
Let us know what fix solves the problem.