I am happy to have found this thread. I have a 2008 Hyundai Veracruz. I realize this is a genesis forum, but it sounds like this electrical issue is on Hyundais in general. I have reported a very similar problem to the dealership several times over the past couple of years. I just got my car back for another fix (steering wheel wouldn't adjust) and of course, they couldn't repeat the problem of the electrical problem- I mention it each time I drop it off for warranty covered repairs. They also gave me the impression that they've never heard of this problem. But maybe I reported the problem incorrectly. I previously told Hyundai that my dash board lights would brighten when I used the turn signal. I think the dash board lights were brightening because my headlights were cutting off for a second and when your headlights are off, the dash lights are brighter for daytime use.
Last night, they went out for a few seconds. I was in traffic and on a well-lit road, but I could see I had no headlights on the car in front of me. I called the dealership as this was happening and told the service representative that my lights just went out. So I told him it used to be the dash lights brightened, but now that I got the car back, the headlights were impacted. So I think it's the same problem all along, but now that it's dark earlier, I can see my headlights going out in the reflection of my vehicle on the car in front of me. And again, last night, the guy I spoke to said he was not aware of any electrical problems related to the turn signal and headlights.
I just tried to repeat the problem and my headlights will not flicker. Does the car need to be moving? Thanks.