Hi Alby,
I was able to do a little research and it appears that you are not the only person with this problem!
According to a question asked on the Google Forum, one of their experts suggest two things:
1) "Try to clear the cache and data of the Camera app. Some have reported this solved some issues they had with the Camera app."
2) For those of you who haven't requested a new device could you boot in safe mode to see if the problem persists.
Ensure your device's screen is on, then press & hold the Power button.
Touch & hold the Power off option in the dialog box.
Touch OK in the following dialog to start safe mode.
I hope this helps!