nexus 4 shut down & won't restart

[AC Question]

My nexus 4 just suddenly shut down & won't start back up. It's dead as a doornail. plugged it into the charger & nothing. Can someone help?

 

[cpaight]

Sometimes a device will go into a deep sleep mode and you have to hold the power button down for a much longer period of time before it will start up.

 

[Mcwong]

Had the same intermittent problem on 4.4.2 and 4.4.3. Fixed by uninstalling & re-installing Google Now Launcher. Nothing was lost, all widgets & icons appears when you re-install. My Nexus 4 has not encountered the problem for more than a month. Now on 4.4.4 and it feels like a new phone.