It is simply, software problem. You need to understand this that the Broadband's interface is the only interface bound to the Modem hardware correctly. All the other softwares you use to control the Device have only half the functions valid. Even if they seen working they are actually not. This means that you are actually fooling the Modem. The time your Modem switches off, it is not actually giving off the connection.The simple way, try another software to perform the same operation what you are trying to do now with this software.