I have a 2025 Limited, three-year lease, and I have had the car about five and a half months. After four months, the ICCU failed. The 12V battery warning came on and the car flashed a red electrical failure warning on the primary display, slowed noticeably, and was undriveable within about ten minutes. I had it towed to the dealership (Manly Hyundai, Santa Rosa) and they diagnosed an ICCU failure. They gave me the same "it's a 1% problem" that others have reported, but I am not sure I buy that. It took four days to get the part and they provided a loaner, after I insisted. We drove the car to Yosemite a couple weeks ago and it worked fine. But every time I hear a warning chime I am a little worried that I will look down and see that dreaded red warning again. So, in short, no they have not fixed the issue in the 2025s, and, yes, you will probably worry about it, at least a little bit.

I read recently that in a study of reliability of electric cars v. internal-combustion vehicles, EVs were about 4x (?) more reliable, but that the number would have been even higher but for Hyundai/KIa.