iPhone 4 and GPS accuracy

[imkingofjungle]

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?

 

[Aeroflux]

All GPS units have a range of accuracy. Also depends on how many satellites it can lock on. Download the free version of MotionX GPS, it lists it's current range of accuracy, among many other things.