Incoming calls not coming through

For some reason I'm not receiving calls. If I reboot my phone it'll work fine, but I don't know for how long unless someone leaves a vm. I have no idea what's causing it, nothing has really changed but I also don't know how long I've been having the problem. I'm running pure nexus rom and Franco kernel if it makes any difference. Any ideas?

Sent from my Nexus 6 using XDA Free mobile app