Hi guys, First time poster here. I bought a 13 LTZ RS about a month ago and I absolutely love it. Its got 76K on it and drives like a dream. Ive got a 1250 mile/60 day warranty(used car dealer) on it and i just noticed the other day at times when the engine is warm, if your at a stop for more than 3 seconds and you let off the brake, it bumps into gear. Doesn't do it if its manually forced into 1st gear - Its smooth as ice. Also at times (Very randomly) the 3-4 shift flares. Hasn't done it at all this past week, but last week it was doing it every other 3-4 shift. I've dumped the fluid twice with little to no avail (it looked dark but didn't smell burnt) Was curious if anyone has run into this before. I really don't wanna give this car back. Its currently sitting at a GM dealer on the used car dealers dime, but hoping its something simple like a TCM update.