We have this car since day 1. No electrical problems, then in December the radio started turning off/on really fast, the DVD did the same. Those were annoying, but what really concerned me is that the park assist turned off light would come on. The car lost all power one time while driving, for about 4 seconds. At this time, the engine decreased power/speed. THAT was concerning, and dangerous. Took the car in, they cleaned the connections to the battery and did a full service on the car. The car ran fine after that.

Update from Feb 15, 2018: It is 2 months later and the problem has started again, but much worse. I was driving on the highway at about 70 mph and fasten seatbelt ding went off, the engine died and the car felt like the brake had been applied, the windshield wipers turned off, the radio turned off and I was helpless for 10 LONG seconds. The "park assist light turned off" light came on, and I saw a brief message about stabilitrak come on as well. The car has started having the radio turn off and on, the headlights turn off and on, and the park assist turned off message as well. It seems to mainly happen when I approach a light and am slowing down, or after being stopped I start moving forward and the power decreases. VERY DANGEROUS.