Hi everyone, I have problem with the 4G network on my IPhone 5. When I'm in very good coverage 4G goes very well, but when I'm in less coverage the 4G network switch into 2G and I have to wait a couple of seconds or minutes to return into 4G again. At the same time, my wife, using IPhone 6 plus doesn't have any problem. What could be the problem? Thanks in advance.