No real problems here. By real problems i mean none that couldn't be fixed by going into the phone's settings. For example, auto rotate stopped working one time. All i did was turn off the phone, remove the battery, wait at least a minute. Then reverse the process, and voila, auto rotate was back in action.
Another time, my wife's phone camera stopped working one day. Please don't ask what was wrong. I don't remember. 
After a while of back and forth it was back up and running. I'm glad that there were but so many settings for the camera app.
That's it.
P.S. We've had our phones since Dec. 2014.
