First time this has happened to me.
I live in the south east corner of Franklin, today, while inside the house, Signal Check Pro sounded the alert that I had switched over from 1xRTT to 1X800. Signal strength was -105db but usable. I was able to make an outgoing call. (3G was on roaming).
Went outside & it switched back to 1xRTT with a signal strength in the mid -90's.
Did this 3 or 4 times during the afternoon, nothing this evening.
I suspect it might be coming from the tower near 51st & Ryan that's been upgraded to LTE for a while now.