I've been experiencing this symptom for the last month or so and it has been getting more frequent to the point now where it happens almost every time I start my VX.
When I turn the key to ignition (or even just "on"), the electrical system will cut out - lights go off, etc. Let the key go and within a 5-10 seconds, the battery power comes back on. If I open the door while the power is off, closing it almost always turns it back on again. It can take anywhere from 1 or more tries to start the engine. Sometimes I have to open the hood and start it that way.
At first I thought I was getting some sort of short off my battery - because I have a marine battery with the extra posts and the extra posts have worn through the hood insulation and the positive terminal can easily contact the underside of the metal hood. I am 90% sure that the battery is not low, when power is on, it is full-power, no dimness in the lights or anything like that.
But, today I stuck a brand new piece of foam over all the contacts on the battery so as to insulate them all. But it didn't help one bit, I still had to open the hood to start the engine 2 out of the 3 times today.
So, before I take it into the shop, I was wondering if anyone here has ever seen anything like this before? It's almost like a circuit breaker that resets itself after 5-10 seconds of being off.