I have a 2018 SXT and lately the rear lift gate is not operating properly. (it’s not power operated). It will not open all the way, it gets stuck like 6” shy of where it should open fully and I have to push it the rest of the way. I keep hitting my head on it and it’s super annoying. I tried to search for troubleshooting but can’t seem to find anything. Seems like an issue with the hydraulics. Has anyone had this issue or know what could be done before taking it to the dealership?