I was going to work and all the lights went out headlights, dome lights, tac went out, radio, clock as if it had lost all power. Car kept running but bogged down. Pulled over at a shopping center and called someone as I sat waiting I never cut the car off but let it run, after about 20 minutes everything came back on as if nothing happened. Had the battery checked it will charge, alternator was checked it was putting out juice. Have no idea why this keeps happening it has happened more then once I am afraid to use the car at all for fear of being stranded in it! Cannot seem to find the problem.