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InsideEVs has an article I know many people will agree with.
https://insideevs.com/news/752720/ev-12-volt-battery-problems/

The 12V battery has shown to be a big issue with Hyundai Ionic 5, Kia EV6, Rivian R1S, and Rivian R1T. The article suggests it may be how engineers are not using the DC-to-DC converter correctly or even fault the DC-to-DC converter itself. I did a quick search on this forum and got 100 posts with 12V battery dead.

I can relate with past experience. All my past Prius suffered from dead 12V batteries within 2 or 3 years, my 2017 Prius Prime's 12V died within the 1st year from a shorted cell. The 12V in my Lexus NX 300h took 5 years before it died but while the article opines it may be the DC-DC converter, I have to disagree, somewhat. It's not the battery location either. The 12V batteries in my 2nd gen Prius and 1st gen Prius Plugin were in the rear, the Prius Prime's was located in...