set it up about a month ago and have been having problems getting incoming calls, i have people telling me they are calling 10+ times and my phone never rings. i tried it myself with another phone on the extender and the same problem. strange thing is it shows 4-5 bars but the 4g symbol is not lit up, its like a shadow. did a little testing and noticed if i shut off WIFI on the phone it works flawlessly and the 4g symbol lights up, turn on wifi 4g shadows and no incoming calls?