I'm definitely no expert but you may want to check the top line of your Go App and look for the little airplane and the vertical lines next to it. Check the little number at the nose of the little airplane and see how many GPS satellites you are reaching. It should be above 7 if I remember correctly. Perhaps you are in an area where GPS signals are not strong. Looking at mine while i write this, I'm connected to 11. It would appear that if you aren't connected to enough satellites, there might be a drop out.