after 4 month of my nexus 5 it started to drop the phone signal ,go to roaming (my carrier doesn't have the 2g connection) ,have the data turned on but not connected,random reboot ,it doesn't started until i remove the sim .
I tried to full wipe and change rom , change kernel , change sim but nothing changed .
Now the play store is sending a new nexus 5 for the warranty.
Someone met the same problem.
Sorry for the bad english