On opening the drivers side door it clicks to let you know it is unlocked but then there is a grind sound that follows going to the back of the vehicle Why.?
Doesn’t sound right to me. Since this car is, at most, ten months old I would ask the salesperson and/or service writer at your dealership.
I wonder if the fuel pump is priming when the door is unlocked. Regardless, having the dealership check it would be a good idea.