I have had a Koodo home setup, model WF721, for over a year now. For the most part it has worked fairly well except for not getting a signal from time to time. Recently however, the phone is only connected about half of the time and I am missing calls left and right and having trouble making calls when I want to. The unit has been in the exact same spot near a window the whole time. Is there any way to increase the signal strength with a home unit?