My 2014 Hyundai Equus with under 49,000 miles is losing power while driving. However, power comes right back on allowing me to keep driving. Many of the dashboard lights come on also while a message on some type of engine issue is being quickly flashed then turns off (not enough time to read the specifics). On the next day, the car operates normally until driven a few miles (about 15 to 20 miles). I called Hyundai and was told that this matter is not under warranty. Any information would help.