I have a 2013 Wrangler Unlimited Sahara with 47000 miles. Sometimes the engine will cut off when I am sitting at a light, backing up or a slow maneuver. It starts right back up but doesn't go right into gear. Shift to drive or reverse, nothing happens. Recently it took several minutes to get it into gear. The dealer can't find anything wrong and no codes are showing. I got stopped in busy traffic and had to sit there with my flashers on until it would go into gear. Could the transmission be overheating? It only seems to happen on very hot and humid days. Thanks.