Noises During Shifting problems of the 2020 Jeep Cherokee

The vehicle was in motion. The vehicle made a notification on the cluster saying 4wd system unavailable, service required. The vehicle then began to shift ruff and the only way you could get it to point a to b is if as soon as you started it you put it in sports mode. The vehicle went into the shop on 10-15-2020 and came out of the shop on 12-4-2020 due to them not being able to get the part which was a power transfer unit. The part got delayed multiple times. After I got the car back on the 4th it started making a rattling noise from the front end like something was loose. I messaged the mechanic and advised him of the issue and he told me to take it in the following day and he would look at it. Unfortunately he got sick and I finally got back ahold of him on Monday the 7th to look at it. He said it seems like something is out of torque and that he would get ahold of me the following day to bring it in so I could have a loaner vehicle. I have since heard from him. My car also made an error code of auto start/stop system not responding yesterday the 10th of December which I notified the mechanic and have yet to get a response.