Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Occasionally this is a problem, not very often but even I have experienced the problem on my iphone. Try soft resetting your iphone by holding the lock and home buttons until the apple logo comes up and try the app again, generally this only lasts for one trip on a single day though. Try another app such as the waze app and if it is ok then you know it is with google maps, however if waze has the same problem then it very well could be an gyro/gps issue or network issue.
Thank you!- Joe
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