I had the same issue. I bought my 2017 Macan used and a week after owning it I got a PSM failure along with an AWD failure. It was intermittent and came on within about 10 miles from starting, every time. I looked through my TPMS and found that the dealer had selected 19 inch tires, instead of the 20 inch that are on the vehicle. I selected 20 inch All Season tires from the selection screen and it seems to have solved the problem. Since Porsches are so highly engineered, these little details make a big difference.