So just a few minutes ago, my iPhone 5 started acting up. Inside our building I lose LTE if I get far from the windows. It switches to 4G, then within a few seconds, the 4G disappears and I have nothing. Yesterday (and for the past few years on my 4) I had great coverage inside the building on 3G/4G. I tried rebooting the phone and it made no difference. Is anyone else having any strange problems? I come back near the windows and my LTE comes back and pulls data just fine. I walk back into the building and it just goes to "no data connection" If it keeps up today I'll try a restore tonight. After that I guess it's off to the Apple store.