Issue Receiving calls and texts at home

At my home I have a Verizon network extender along with xfinity wifi. We have two phones that both use the XM service and routinely when both of these phones are in the house they do not receive calls (calls go straight to VM) or text messages. Both phones show full mobile network signal along with full wifi signal. If the phones are rebooted or toggled in and out of airplane mode they both start receiving calls and text messages. We also have another phone that uses Verizon Wireless and it does not have this issue. Does anyone know why the phones the use the XM service are doing this, there is planety of signal in the house between the wifi and the VZ network extender? On a side note, all three phones are Samsung phones.