It’s a little unclear as to what sound you are talking about. Here is a quick video of the Lens Motor clicking. Completely normal and happens every time as it should. Just part of the calibration for the head lens motor.
If it is not the head motor but is as shown in the following link then it has happened to almost all of us. Most times the gantry will also move when making this shuttering noise. A recent update is supposed to lessen the number of problem calibrations but not eliminate them. If you move the head to the center prior to turning it on then it shouldn’t happen.
If the sound is something else then I don’t know.