NHTSA Complaint #11440298 — 2014 JEEP CHEROKEE

I experience a loss of power while driving and a message pops on the screen telling me to put the Jeep in Park then back into gear but I can only get it to go back into gear and drive after parking and restarting it. The park function seems to go out as well and I have to use the parking break to stop from rolling away uncontrollably and while I'm pushing the break to the floor there are awful griding noises coming from underneath the Jeep. I've experienced these issues with and without a check engine light and once before the low battery voltage light came on and a day later turned back off. The check engine light also came on and the jeep lost power while driving the day after an oil change but does it randomly other times too. No car shops can figure out what it wrong and the dealership I bought it from wants to charge me just to look at it. Please help I'm a single mom and need safe transportation!