I had the same issue about a year or 2ago..mileage was at approx 100K & I was headed to work, cruising on highway at about 60 - 65 mph usually & as I exit and come to a stop my VSC light comes on. I arrive at work, park, come back out about 4 hours later and the car won’t start at all. won’t crank, brake pedal hard, and only thing working are the interior lights (dash, radio, a/c, etc). I spend about 2 hours reading posts online and trying everything. I eventually get the car started but when I did, it had no power, I couldn’t get the car to go faster than maybe 5 - 10mph. I then found a forum post with someone having a similar issue and they said to disconnect the battery for 30 min & then immediately crank the engine & give it some gas lightly. I did so & it worked! For whatever reason! VSC light & traction control light disappeared and I took it to the dealer first thing in the morning but they couldn’t explain what was going on since it was no longer doing it. Since that incident 2 yrs ago I have not had an similar experience & I just replaced battery 3days ago after it went out on me after a long trip.

So I would carefully investigate every possibility before moving forward, double even triple check battery & alternator voltage, check to see if you have a faulty positive or negative adapater, check for corrosion on battery? Etc. hope it all works out for you, keep us updated