I think this has happened twice to me as well since the update. It's weird! A phone reboot is more acceptable than it dying in my pocket with no sign that I'm not getting calls or notifications
Re: why does my Google Now give me so many "nexus 6" updates from religious/christian/epoch/etc site
I've wondered this too! Anyhow it's not just you :)
I have this too, but I don't get the dropouts if WiFi is turned off.
It is pretty inconvenient to have to use only one or the other, but it is what it is