Samsung Galaxy devices issue: "Server error occurred. Restart Camera"

When using the stock camera app on a Samsung Galaxy S6 phone, I sometimes get the error **"Server error occurred. Restart Camera."** It's then necessary to close the camera app and restart it. It's a hassle that often results in missing photographic shots. Plus, the last photo taken is not saved. I have tried clearing the data and cache for the camera app. I have also updated the stock ROM to the latest Nougat version available. I have performed a factory reset. Finally, I have sent in the phone ***THREE TIMES*** to Samsung for repairs. None of these actions has resulted in a solution. Questions: - What is causing this? - What server is the error referring to? - What is the solution to prevent this error?