In 2022 we experienced harsh shifting between gears and had dealership assess and they flushed the transmission. We were told other than that there is no remedy. The problem still persisted occasionally. Recently while driving the EPC light and check engine appeared as well as engine shacking and jerking. Were broke down on side of busy highway. Getting it back into dealership preliminary testing is that there is engine misfire and transmission. Frustration that GM is in class action lawsuit for transmission issues and that we had it inspected before with being told nothing more can be done. Vehicle is currently in shop being diagnosed for repairs.