I just got a Droid Razr in February, it has worked fine up until 2 or 3 days ago. Now it has no signal what so ever and only shows gray bars. When I am at work, it has 4G. At home it has no signal. My wife has the same exact phone and her phone has 3G the whole time she is at the house, and has a signal. Is there anything I can do to fix this?