Had my HTC One about a week and had taken a few pictures but not too many. Anyway took a few today and first 3 were fine, then noticed on the 4th that it wouldn't focus. Tried everything - off on, settings reset, and even installed another camera app to see if it was just the stock camera. But still blurry. Noticed that it happened after I'd zoomed in and zoomed out again. Does this sound like a hardware failure which means it has to go back? I guess I'll have to do a factory reset tonight which is a pain as I've just got it how I liked it. Thanks in advance.