What servo said is the normal behavior but your additional info..sounds like a malfunction to me if it is happening randomly at any distance.
But the half press of the shutter release normally finalizes the position of the framing window. If it is not at the correct location after half press, definitely a malfunction.
Panasonic LX100, Sigma Foveon, Fuji X and Panasonic CM1
Last edited by GaryLH : 03-09-2016 at 09:18.
Reason: Add some more comment