I have been having a very annoying issue since the early builds and continuing until now. The phone app will on occasion stop working completely. I will try to place a call and I can hit the call button or the contact as many times as I want, but the call won't get placed. If I wait 5 minutes or so, then they all get placed simultaneously, which results in lots of calls being put on hold. So basically, sometimes, I can't call anyone. It's extremely annoying because it happens with regularity. Does anyone else have this issue?