My wife was driving and she rolled up to a stop sign and stopped and our SUV quit. Just like she had turned off the key; not a stall, not a engine stopped running, all power in the SUV ceased. She shut the ignition key off and started it again, it sputtered for just a second and then no problems.

I was not there to diagnose but I cross examined her to within an inch of our marriage.

Never had this happen before, and I want to head it off before it leaves her and the kids stranded. any ideas? 145,000 with no major problems, regular maintenance.