I agree to shooting it, I HATE electrical issues. We went through every power option breaking in a Dodge Caravan way back when, and it was a nightmare. It ended when we traded it in with an always-wet-inside Cavalier for a Saturn, and never looked back.
Anyhow, I was told it could be a connection before, but it's been to the dealer twice with no luck. An aftermarket car starter was put in, but this was a problem since we got it, and we had it for a year without a starter yet the problems existed even then. Lately, it seems it's happening a lot more often for a lot longer.
The thermostat was also a suggestion, but never the battery. Could a battery in a 2008 already need replacing? Seems a little strange to me, but I could believe it, as it is the factory battery. Also, the temperature for the interior of the car has always been right, but exterior is sometimes way off. That happens more in the Summer than the Winter, actually.
* Yesterday, on the little display, there was CAL - which, I didn't know what it meant. Right when I was turning into the driveway, Calibrating (Something) quickly came up, and naturally I missed it as the wheel was in the way. It was gone by the time I stopped the car. Any ideas, and could it be related?