A guy on the 3.7 section of this forum was having similar issues, so this is what i posted in his thread:
I'm shooting from the hip here, but heres what i'm thinking.
Part of the way the computer measures "traction" is by using a Hal Effect Sensor
( Hall effect sensor - Wikipedia, the free encyclopedia
At the rear hubs to measure wheel speed. Basically, with it being cold, i can only guess that these sensors are becoming unhappy some how. Maybe if theres snow, salt, grime, crap, ice? Or just some other junk in there, its losing signal and becoming unhappy. We've seen this happen on cars before that remove the under tray and the Crankshaft Position Sensor (also a Hal Effect) will get dirty and the engine goes all sorts of haywire. Perhaps then, as you drive and warm the car up the sensor regains signal?
Total shot in the dark, but it wouldn't take but a couple of minutes to jack the rear of the car up and slide under there and take a peak. If i remember correctly they're located opposite the Caliper. For example, if the (rear) caliper were located at 3:00, the sensor should be around ... mmm 7:00 or 8:00, perpendicular to the hub. Cant miss it.
It doesnt seem people in the "warmer" states are having these issues, its the guys that get snow and / or more inclement weather.