I have a 2004 XLS Endeavor. Occasionaly, when I start the car, the radio, a/c, andlcd screen do not work (basically everything on the accessory power). It would be easy to figure out if it was a constant issue. It happened yesterday but then this morning it was fine. The strange thing is that it seems to only happen when the car has been sitting out in the heat for a long time. I don't see how that could be related, but I fgured it is worth mentioning.

Also, the clock doesn't keep time very well. (Side issue)