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I have only had the problem happen twice myself, and it was after the car had sat for a few weeks then I started it up. I have not had it happen since, and my battery volts are normal. How ever I am upgrading to a Red Top Optima, and I am curious to see if the car sits for the same period of time, if it will give the same message with the new battery.
I have had the exact same thing happen with my z06 when it has sat for a while.
I had all kinds of problems with my Camaro sitting for weeks without a start until I switched it to the red optima battery. Now I can leave it sit for over a month without any problems.