After driving about a mile with a cold engine, I lost power steering and all the dash lights came on (battery, oil, all the doors registered open, etc). I pulled off the road and turned the car off. I am sure the engine was still running, because it was uphill to where I pulled off from where the electrical failed.
When the tow truck arrived, we restarted the engine. It looked fine, but after a couple of minutes, the lights were on again. My dealer has it today and (thank you Murphy), my car has been running fine for the techs.
What might be causing this problem?
I have about 63k miles on the car and it was last checked out at the dealer in December.