Cold Starts? MIL & CEL Lights...

I have a question/problem.

I've been experiencing this wonderful display of Malfunction Indicator Lights and Check Engine Lights since the temperature here has dipped below 40F (sorry I don't know the conversion to Celsius) almost every day when starting my '01 Prius (98k). <sarcasm off>

I took it to the stealership when it first started happening and they pulled a code that said the "engine didn't start within 6 seconds", but nothing else was wrong. They told me to keep an eye on it. Well the two lights have been coming on almost every day since I took it to them. I just turn them off (thanks to PriusChat for that little bit of info) and head on my way. This occurs when the car has sat for a long while, overnight or while I'm at work (8 hrs).

What happens when I turn the key is this: it will run for about 30 seconds and then the lights (always both) come on and the engine dies. Sometimes the engine shutters off violently. But it always restarts and I always get the lights to go off. Nothing seems to be different when driving the car, I have no problems otherwise.

Any suggestions?