[dwd1985]

I drive 15 miles to work, parked my car, it sat for about 40 minutes. I went to move it, and as I turned the key, there was absolutely NO power at all. Not even enough for a relay click or the radio to turn on. Nothing at all worked. So as I was worrying, I had my door open, and then all of a sudden, the door light came on, and so did the green ignition light, and I tried to start it, and all was fine.
What could have caused this? and is it osmehow related to my recent problems?
As many of you know, I have been killing alternators recently. But I put in a genuine Subaru re-manufactured one only 12 days ago. All has been fine since.