neurorx said:
It seems to occur in lower light situation like indoor shots or shade....shooting at ISOs above 5600-6400. Typically it is with people photo's.
Show some examples with settings, there is a lot of possibilities. For example, using one shot mode for a close portrait can be oof if you lean forward or backward as you press the shutter. This happens to some.
If you use AI-Servo, the camera will adjust the focus up to a point, but --- It will also let you close the shutter before focus is reached.
For a still portrait, use one shot, do not focus and recompose, and make it a point to not lean as you close the shutter.
There are a lot of possibilities like this, so provide information, and better help will be forthcoming. Post photos and give the camera, lens, focal length, shutter speed, aperture distance to subject, camera settings such as which focus points are active, and 1 shot or AI servo, those will help users to give you a better idea as to what may be happening.
Some lenses are inconsistent, or a damaged lens may act up as well. You can get a idea as to lens issues by focusing on infinity, then on a relatively close object taking photos at each focal length. Do this 10 times (20 photos). If the results are wildly all over the place, try with a different lens. If there is no issue with a different lens, this points to a problem lens. If its still not reasonably consistent, look for a camera issue.