how to stay on EVDO while tethering (prevent falling to 1X)

[azz777]

From times to times, my mogul falls to 1X while tethering without I am noticing it. Is there anyway on keep it stay on EVDO while tethering and not falling to 1X? I'm in metro NY with great EVDO coverage. I am running the stock 3.35 sprint ROM, and have try to play with the preferred operation mode, while I set it to HDR, my phone doesn't work at all, either Automatic or Digital will do the same thing which from times to times, it falls to 1X by itself. Any helps are greatly appreciated.