All wheel drive malfunction and dealer can't figure it out.

[Toby@19]

I have a 2020 Telluride with 45,000 miles on it. My all wheel drive light came on. I brought it in to the dealership. The code read that I had a bad sensor. They replaced it and after about 8 miles, the light came back on. Brought it back the next day. They said the code reads that I have a bad coupler. They ordered one and when it arrived, they installed it. Once again the light came on before I made it home. I live about 10-12 miles from the dealership. This time when I brought it in they said that the coupler they received was faulty. So they ordered another. Today they changed the coupler and you guessed right. No change. They don't know if there is a short, basically they don't know what is causing the problem. Meanwhile you can feel the jerking when driving and I'm afraid of getting stranded. On a unrelated note, my back windshield wiper and my intermittent front wipers occasionally act wacky. My rear wiper will still run when the switch is off and the intermittent front wipers will sometimes quit working. They will stop in mid wipe. I turn them off, then back on and they will work again. And my time and date will sometimes zero out as if the battery was disconnected and when it comes back on, the date and time is wrong. Has anyone else experienced any of these issues?