Z intermittently completely dead -- electrical gremlins

chillz

I searched, but can't find quite this issue: the door opens, and then -- she's dead, Jim. Like the trunk won't open, no lights on the dash... nothing. The only electrical thing that works is the auto window up when I close the door. Can't lock it either (the mechanical key is beyond cranky). The first time it happened was at home. I took the winter car to work, and the Z started up no problem when I got home. That was last Tuesday. Today i got to work, but she's dead in the parking lot there. Anyone had this problem, either with this car or another?