I've tested the iPhone4's GPS accuracy with maps and I have to say there is something wrong. When I try to pinpoint my current location, it puts a pin to my neighbor's house, the first few days when I tried this, it inserted a pin to my current location (my house). but now it doesnt do it anymore, it pins elsewhere, it always pins near my exact currently location, but not exactly where I am. Is anyone getting this problem? is it this normal? should I return it for a new one?