My wife's phone doesn't seem to get a correct lock on it's location in the standard maps app. It's either off by 10 blocks or its off by a block. Usually it will just have the blue circle around it like its trying to zero in our position but never does. It never locks our position and "throbs" with the blue halo around the blue dot. I can have my phone right next to hers and mine will show the correct location but hers won't. I've tried Navigon with her phone and it just acts like the GPS is inactive and turns red. Does this sound like a malfunctioning GPS chip?