2. I had an issue with my Nexus 4 on day #4. I was not able to record video, the button didnt respond. Restart fixed it - but after few hours the same issue. And the Camera app stopped working on day 5.
1. I took it to the service center(I have never been to any service center before) - they rep was very friendly and he said it seems to be a sw pbm, he reinstalled the OS. Took about an hour, NO ISSUES till now.
In my friend's Nex sometimes the bluetooth can't be switched on how hard u slide, it will go to off button- once u restart the phone - the bluetooth will be ON. Just look out for them - these are random pbm - u wnt find it at first. Most probably u wont have any issues at all.