Yesterday, I noticed that the screens in the back of my car were on mute. Totally no sound. I tried everything, but I couldn't fix it. I also plugged in a USB flash drive, and the videos showed up on the right side but not the left side.
I came across this JB4 Tuner as a popular option for the Grand Wagoneer. People seem to have had good experiences with it
https://burgertuning.com/products/jb4-tuner-for-jeep-wagoneer
My Wagoneer Obsidian also had a sudden battery drain while driving. This left me stranded for FIVE hours. A new battery fixed the problem, but with a car that was only 10-month old, it was concerning...