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Did you try settings-apps-all-camera,force stop and clear data?See if the same occurs.
I have the same behavior. But mostly happens when the phone is turned off and I want to take a picture by waking up the phone via the dedicated camera button. Not sure if it is related to having Stamina and all other power management options on.
sony quietly released a big update for z2 now its camera dosent crashes when recording 4k video over 4 mins and improved touch sensitivity but didnt improve low light pictures but the question is so many problems in z1 when will those be fixed
I used the SUS tool to reinstall the firmware. It performed the update and does a factory reset. I've set the phone the same way and haven't seen the issue.
I do have to day that there are a few differences in behavior. Ex: when screen rotation on, the home screen now rotates (did not see that before)