which OS are you using?
the 5.0 Beta OS builds have a new option within the camera menu, for
Autofocus:
this hasn't been mentioned much in the 5.0 discussions, and i only just found it a week ago.
if that's not the issue, find a picture from before (when you were pleased with the image result) and take a new picture of the same subject, with similar lighting conditions. compare those two and see what you think.