Alternator/generator/regulator problems of the 2011 Kia Motor Sedona

Vehicle keeps losing all power while driving. This last time it happened when I was turning onto a busy street! the first time the mechanic replaced the alternator. That lasted 3 days. The mechanic thought it was a defective part so he replaced it. That lasted another three days until we lost all power again. This time the mechanic did some more research and replaced the instrument cluster along with a third alternator. The van ran for two days this time. As of writing this my vehicle has been in the shop for two weeks. The mechanic has told me that with the research he has done, this is a common issue with kia and nobody seems to have a solid answer as to what to do to fix the problem. I was told that some vehicles are fine for weeks others for months and then the van dies without warning. Please help! I need a reliable vehicle. Thank you. Also, when I say the vehicle loses power I mean all power, no lights, no instrument panel, no gauges, no idiot lights, no windows, no shifting of tranny. It will go 2 or 3 mph down the road.