Please tell us some basic information before asking for help:
Model Name:ZB602Kl
Firmware Version:424
Rooted or not:No
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app): Gcam
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
The gcam shutter for the rear camera sometimes fails and it is not possible to take the picture ... Then I have to restart the device to get it back up normally, try to solve this problem.
