I have a lumia 830 and had the same problem , the solution for me was, uninstalling the program and installing "lumia camera classic".
The problem were:
- Video could not record continuously for more than 40 seconds.
- Photos were slow to open
- The program just stopped working and had to lock the phone then open it.
The problem were:
- Video could not record continuously for more than 40 seconds.
- Photos were slow to open
- The program just stopped working and had to lock the phone then open it.