I haven't had any problems with the X for the longest time (Knock on wood!) I upgraded the NAV system with the Final V26 on Sat afternoon and drove around for a bit...the screen looked amazing. Absolutely love the graphics especially with the flag for the destination, almost like a game!
Parked back in the garage for the rest of the night, and Sun morning... dead! Just a click and that was it! None of the doors were open, none of the lights were on and I even checked the trunk since the latch sometimes doesn't lock properly and rattles.
The only thing I can think of is that the hood may not have slammed shut completely after I filled up with washer fluid, but that shouldn't matter should it??? There's no light in the engine compartment...