Help No 3G, very poor signal.

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So I got a warranty exchange on my Droid on Monday and the phone hasn't been able to get 3G at all. Sometimes it can get 1x but very rarely. The reception is also spotty at best and about half the phone calls I attempt are able to connect. I thought it might be a software issue so I rooted and installed a back up I had of my previous phone. When that didn't help, I unrooted and went back to stock. On top of all this, I've also called *228 about 20 times. Anybody have any other suggestions before I have to exchange it again?