I just had this happen the other night. I can't recall that there was any issue with the PS3 shutting off before getting back to the GT Life screen. I had just driven a 0.0 miles car for several seasonal races and then when I started up the next time the car still had 0.0 miles on it.
The weird thing is that it seemed like it may have happened before on the same car. The car is the Volvo C30. I seem to recall that there was a seasonal specifically for the C30 back in 2011 sometime. I bought the car for that seasonal and then ran it several times. When I got in the car the other night to run the Hot Hatch Seasonal, I thought it was odd that the car still had 0.0 miles on it, but I had switched to the car 3 times (I usually never switch to a car and then don't drive it).