where should i start to troubleshoot the problem or do I need to take it into the dealership?
With the information you have given, it sounds like 2 different items are shorting. Those items usually have seperate fuses in the fuse panel. I would take it to the dealership versus the Mobil gas station on the corner, if you know what I mean. I have forgotten, some of the new car stereos are triggered to shut off, when the door opens (after the key is removed, it will stay on). You could have some moisture in the door panels, causing a short. Just guessing, because we are about to float away. GOOD LUCK!
