Numerous reports indicate that Apple and AT&T are investigating a rash of iPhone 3G connection problems affecting some handsets. A San Francisco Chronicle article tells the story of one iPhone user, who claims to have had ongoing connection problems with the 3G. “I was driving down Folsom Street in San Francisco, and I got a dropped call 10 times. I get dropped calls just standing in one place,” said Stephen Yarbrough, a 34-year-old…