Wiring problems of the 2018 Nissan Sentra

I purchased my 2018 Nissan Sentra with 5 miles (basically brand new) the car currently has 10,000 miles and the vehicle is kept maintained. A few months after I purchased the Nissan Sentra I began having issues with my back up camera screen in which it began blacking out and flickering in and off. Since it had been raining in my town I assumed there was some sort of short or water must of leaked into the wiring system l, I took it to my local Nissan dealer and they couldn't find any type of issue with the car so I left it at that I haven't had any issues with it gain however it hasn't rained either so I'm just waiting to see. After that occurred I began having issues with the front radar crash sensor. I get a warning ⚠️ signal on my dash constantly reading that I have a front radar obstruction which there is nothing blocking the sensor. Shortly after that my ac began blowing up streamlined hot air and went out one day. I've attempted to have it fixed and there's nothing they can find to fix the issues. I've had the car for a year about 10,000 miles and these issues have raised concern. The vehicle is under warranty and still these issues cannot be fixed.