So I've had an issue with my 3gs since I got it the signal seems to fluctuate a lot. It will go from two bars, to five bars, back to two, in a matter of a minute or two, without even moving the phone. I thought maybe it was just because the signal isn't great in my area (I'm on the Edge network), but this past weekend I was in Grand Rapids in a high-signal 3g area and it was still doing it. Is this a common problem? Anyone else having/had issues like this? If so, how'd you fix it? Was at an Apple Store this weekend didn't think to ask about it.