[Q] Nexus 5 Camera issue - Android 5.0.1 topic

Hello Guys

I have Nexus 5 running Android 5.0.1 latest update. Not Rooted. I'm facing issues with the camera. "Can't connect to camera".
I have clean the cache and do a lots of things but this error only goes when I restart the device. I don't want to root this phone because there is no need. Can any body tell me the solution to fix this...