I have a 2018 JLU that had somewhat similar problems (electrical). The instrument cluster would start going nuts - throwing dozens of codes. I first had it in to my Jeep dealer 3 times. Once they thought they had found the issue - a crushed electrical connector in the transmission. Then it...
So mine did it (the "flashing") again, after sitting in a parking lot for 2-3 hours cold temps. This time, I drove it while it was going through all of these warnings (going berserk), and nothing bad happened. When I got home, I shut it off - then re-started it - and everything appeared to be...
Mine did that 2 days after picking it up a month ago. Called the dealer and they said it was the computer being "flashed?"...meaning updated? They said not to drive it or turn it off until it finished the update or it would do it again or might not be driveable. Fortunately, I did wait until...