The OS upgrade to 4.4.1 broke my Nexus 5!
Google has just pushed out an updated version of Android for the Nexus 5, fixing a number of problems with the camera system on the flagship device. Android 4.4.1 is now available to download, and it should patch complaints such as slow shutter speeds in good light, and sluggish autofocus, amongst others.
The official word is:
All of this gets a boost with an update to Android 4.4.1 rolling out today to Nexus 5. It improves the camera with faster focusing, especially in low light, faster white balancing, for truer colors,…
via Imaging Resource News Page http://www.imaging-resource.com/news/2013/12/06/android-4.4.1-brings-photography-fixes-to-the-nexus-5