Hello! I have a 2012 GC with the 3.6 V6 and the W5A580 transmission, a little over 100k miles and occasionally, the tranny will not immediately shift out of 1st gear when starting from a stop. Shifting manually into neutral and back will solve the issue or on occasion, once rpm's get high enough (but too high) the shift into 2nd will eventually occur. I am thinking this is an electronic issue, but would appreciate any insight others have experienced. Thanks in advance for your replies!