I am facing the same problem for now a month excluding few lucky days but Reliance has no answer for that. Even their main control center doesn't know what is the problem. I think may be they just don't allow you to get ip address if you are connected for too much time or if you have downloaded certain amount of data. Especially when you have unlimited connection. I am not sure but Tata does this kind of automatic disconnection. Let us see how many people get this problem.Rahul.