P0626 Fault in 2016 Hyundai Accent SE: Alternator Failure Despite New Units and Battery Replacement

Two weeks ago, my 2016 Hyundai Accent SE suddenly died while driving. The battery warning light was illuminated. After removing both the battery and alternator for testing, I found the battery to be in good condition but the alternator was faulty. I replaced it with a new unit, which initially worked for four days before failing again. Upon removal and inspection, the second alternator was also found dead. I then returned and purchased a third alternator, along with a new battery (as the original was over four years old). The vehicle cranked successfully, but the third alternator failed to function properly—running solely on the battery. Recently, I've started receiving a P0626 diagnostic code, which I understand is typically associated with alternator issues. However, this is a brand-new, unused alternator that has failed twice in just two weeks. Additionally, new warning lights have appeared: power steering and throttle position sensor (TPS) lights—neither of which were present before the first alternator failure. This behavior is highly unusual for a standard alternator issue. I've searched online extensively, and most sources point to alternator problems as the root cause. Yet, given that all replacements are new and properly installed, I'm concerned about deeper electrical or regulator issues. If this had been one of my Camaro or 1972 Impala models, it would have been fixed immediately. Any insights into possible causes for P0626 in a 2016 Hyundai Accent SE—especially with recurring alternator failures and new warning lights—would be greatly appreciated.