Same thing happened to me. Got mine yesterday, worked fine in the store, but when I got it home kept getting lost data connections. Only mine would last for 5 to 10 minutes each time. For me it seems like I have a spotty 4g connection in my area and it kept toggling between 3 and 4g, which it does not do quickly. Tech support suggested to switch to a 3g only connection until I get a better 4g connection. It has worked fine so far, no more lost data connections. The phone is still really fast even on 3g.