Every once in a while maybe once a month all my calls go directly to voicemail until I reboot my phone. After I reboot my phone everything is normal. I have a strong Verizon signal and do not disturb is turned off. I also have an iPad and have Verizon messages app on it. It is a WiFi only iPad. It also did not ring when I was getting a call. Also I got no notifications about a missed call but it did the message did go to voicemail. Any suggestions?