GPS on iPhone4 Sometimes doesn't work

Hi Everyone.
I have an iPhone4 which was purchased from Koodo. When I used google map to navigate, sometimes the gps couldn't figure out where I was.
The arrow was off the street and it stopped moving. I had to reboot my iphone to make it work. It has happened about 4-5 times in a month. Most of the time, it is fine. BTW, when I use automatic time zone, it never works I had another iPhone4 (unlocked from Apple Store) which never had such problem.
The IOS is up to date. I called Apple store asking for an exchange. They said no coz I got it from Koodo rather than Apple Store. They asked me to sign up the Genesis Bar instead.
Did anyone have a similar situation before?
Thank you very much for your help.

Morning Hunterkyp,
Thanks for using Apple Support Communities.
GPS accuracy varies depending on the number of visible GPS satellites.
Locating all visible satellites can take several minutes.
For more information on this, take a look at this article:
iOS 6: Understanding Location Services
http://support.apple.com/kb/HT5467
Best of luck,
Mario

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