Good morning Neil,
Thanks for contacting us and please provide more detail about the problem.
1. What apps have you installed before the problem appears?
2. Have you rooted your phone recently?
3. Which phone do you use, Flash 2 or Flash Plus 2?
Would you please try the steps below and seed us feedback?
1. Turn on Camera, click setting, and then choose Restore defaults;
2. Back up important data and then factory reset.