Has the check engine light come on at all? There should be a history they can check on the car if so. I had this problem (very random), and it turned out to be a faulty fuel pump. Also, having drained my battery once, GOOFY STUFF happens if your battery is even slightly undercharged. Put it on a trickle charger (battery tender) for 24 hours and see if anything changes. I actually had a passenger blinker and brake light stop working, cruise stop working, auto start/stop, DNA selector, and electronic throttle control stop working because of the battery not being charged sufficiently. Frickin’ Varta batteries. Once I trickle charged everything was back to normal (even the brake/signal lights). Best of luck to you!