Diamond Switching to 1xRTT

[Broncho]

I just got a Diamond Wednesday night and I've noticed it switching from EVDO to 1xRTT several times when I'm at home (1-3 bars) and for the first time today when I was at work (avg 4 bars). So far I'm liking it but it seems like this constant switching isn't good and is affecting the battery life. I've read some of the threads about switching the radio or the polling but haven't tried that yet. I'm trying to figure out if I got a lemon or not. I'm considering calling in and getting it re-programmed (partly to get the MSL) but haven't done it. I would appreciate anyone's opinion on whether I should go ahead and exchange it or try some of the other things first.