I know exactly what you are talking about! I had a thread complaining about the same thing. Took my phone into the Sprint store and it failed "once" a test and they gave me a new phone and the exact same thing happens to my current phone. Can't go down the street (or even sometimes sitting still) and I lose data connection. Listen to streaming radio on Tune-In and it cuts out constantly. Used the Scout (Telenav) GPS and always got "There is no cell phone coverage / Now there is cell phone coverage" during a trip to Wisconsin and Mississippi this month.
Heard the excuse that the towers are being upgraded and that is the reason service is so poor. Almost tempted to say well put that in writing so that I can go to another wireless company without an ETF.
Came from the HTC LTE and never had so many drop outs. Yes, there were marginal spots that I would lose service, but in the past I have made it to Wisconsin and back without dropping service once not to mention 50 - 100 times, so like you think it is directly related to the phone. When you take the phone into the Sprint store, they are like well nothing what we can do, or well that is a lot of work and doubt we will find something. It is tempted to reactive my old HTC LTE and see how it does because I know where the marginal areas are at and the areas that are not marginal that I still lose connectivity on a constant basis with my HTC One.
Just wonder if like the first I-phone made of solid shell, that the metal casing isn't affecting how well the phone does in the terms of the ability to connect and stay connected to the cell towers.