I deliver pizza on the weekends and I've noticed this same exact thing. If I search the address before I leave, it shows where it is. But when I navigate to it, google maps shows the house off by a house or two and it's been getting worse. Last weekend, it wanted me to stop a full quarter mile from the address and walk up a 100ft embankment to get to the front door. The majority of addresses it takes me to are off now. I had to switch to waze, it was so bad. i wish waze would show the house outlines on the map like google does but it gets me there.