google maps while driving????

i put the google maps app onto my 8310 last night, pretty cool i guess, but i dont really need it lol. am i the only 1 that seems to have a problem with it though while moving? today i could not send OUT a sms but i could get them incoming. at the same time i could call out, but not get an incoming call. i totally forgot about the google maps thing so i shut it down completely and then all of a sudden it started to work again. now, i can totally see if this was due to a "safety" feature, but i was the passenger in the car so im not sure if that is the reason???? anyone else have this problem? i have a garmin in my truck, so i dont "need" it on my phone too, it was just something to have. so is that common and supposed to do that or was it a coincidence?

I have had one or two instances where that occurred. I use it to get a site location while at work. I also use it on trips. But, I don't have a Garmin. So, you really don't need it:)