Transmission troubles 2012 Equinox 4 cylinder

jeegolly

Hi I have a 2012 4cyl chevy Equinox with 41k miles. For the past 3 months I've experianced a hard shift into 3rd gear after a sharp left turn. As I straighten out on the turn I feel the transmission "tighten" like its disengaging then clunks into 3rd gear. I took it into the dealership and they checked the fluid and of course they said everything is fine. Clearly it's not. Also I've noticed when stopped sometimes the equinox shakes and slightly moves even when my foot is on the break. Can anybody give me some insight since the dealership keeps saying nothing is wrong?!