I had this same exact problem! While on a 14 hour road trip to Omaha, drove through a torrential rain storm in Wyoming. Shortly after the rain, immediately got a blind spot error on the dash, all electronics went dark, windows would not work, and the heater started blowing hot air into the cabin. Could not adjust heater or turn down. I pulled off the freeway and the truck seemed to be running fine. Disconnected battery, waited about 30 minutes, reconnected, nothing changed. Drove another 6 hours to the nearest dealer. While explaining my dilemma to the service manager, a technician happened to overhear my story. He jumped into the conversation and immediately asked if I had a cracked tail light. I told him I did have a hairline crack from backing into my garbage can. He said most likely moisture had entered the tail light and was shorting out the electrical system. He spent the prior week chasing down the same exact problem and was convinced I was experiencing the same.
Turns out he was right! Technician showed me the wiring bus under the driver side dash where everything is connected. When he disconnected the cracked tail light, everything functioned properly again. In the end, I had to replace the tail light to fully restore everything back to working order. My part with all the sensors and features in my truck was $1200. Essentially one thing gets shorted out, it affects the wiring bus and everything connected to it.