I bought a Nexus 5 yesterday. All good but today, the signal (that is, mobile signal) dropped and even with a flight mode on/off and re-scan for networks it did not pick up. In the end, I had to reboot.
It is completely stock 4.4.2 and I'm just wondering if this sort of thing is a common issue. The only thing I can think is I was definitely in a no signal "black spot" for maybe 15 minutes prior to the drop so it's almost like it "froze" and didn't want to pick up the network when it returned.