A guy I rooted/rom/kernal etc his TB for has been having this exact same problem. I put CM7 on it first with mr2 and 2.5 radios. Both stayed in constant 1x. Switched to synergy which is what I run with the 802 radio. My phone has constant 3g all the time. His stuck in 1x. Switched to bamf forever with the same radio. Stayed in 3g for about an hour and dropped back to 1x. Could it be the phone having the radio issues? Tried several radios and nothing alleviates this issue I'm not in a 4g area either but I do leave the radio settings in cdma/evdo +lte. I switched to just cdma/evdo but it didn't help the problem. Any ideas??