Hi miniman,
I had the same trouble withmy pre-registered car. The sales folk had been using a booster to start it when the battery became flat, and it seems that they didn't follow the jump starting instructions in the handbook. result was a new battery and a new voltage sensor (although I suspect the sensor was OK) The ISG has been working ever since, and the off light has never come on.
On the occasions where it has not operated when I expected it to, I had not gone above the minimum speed since the last ISG, or had downshifted at a very low speed just before stopping. This last bit isn't in the book but it happens consistently, as if the ISG had armed in anticipation of coming to a standstill but had disarmed as I depressed the clutch on the downshiftat very low speed. This might be a load of tosh, but there might be something in it.
Mine has just been in to have the random reset of the mpg attended to (electronics upgrade or a new control module; I don't know which), but it did it again at the weekend!!!!
My passengers can't get a hold of the door closing force required yet. It has to be due to the airtightness of the car. I always leave my door to last to be closed, or open the drivers window an inch before the passengers get a chance to try and fail to close the doors. It always works, and the doors close nicely. Good thing or bad thing? (You might see Kias floating along in a tsunami near you soon!)
Back to the dealers soon for the EPS (turning itself off) fault and the boot floor to be done, all with the best will and helpfulness from the dealer.
I am a bit pragmatic about these faults. Over the 45 years I have been driving it has been pretty common to have teething problems with new models. (The man who drove the recovery truck became a close friend of my neighbour who had a new, top of the range Merc, which had so many software issues. He was locked in it, out of it, unable to start it, unable to stop it.... and he had paid over 70 grand) The Vengais not just a new model, it is a new line in a new factory. As long as there is a will in Kia to solve these issues, I am fairly relaxed about them. To a point. None of the folk I have spoken to at the dealership or at Kia customer service have looked at this forum to see what people are saying. Lets hope the few dealers who are involved on the site, will shout loud for fixes to be found.
Bob