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can somebody shed some light on why this tab has gps when it needs wifi to get some sort of signal. whats the point??? I was excited that I could use it for gps, but once I was in the car, cant get signal. though I oculdve used it like a garmin....is the nexus 7 capable of this?

my screen has been randomly turning black and have to keep hitting the home button to activate again. this is happening with active use, like surfing the web or typing. anybody else having this issue? after waking it back up sometimes I have to wait a few secs before I can use it again as it...