Faced the same issue during match, reproducibility is ~ 2/5. As I noticed, maybe I`m not right, but camera goes out of bounds after Seven dies during ultimate from the skills, not from the weapon attacks.
To summarize, here is STR:
1. Start the match as Seven.
2. Learn ultimate ability
3. After using the ultimate let the opponents kill your hero with skills(not sure exectly, maybe could be happen with different type of kills)
4. Camera may go out of the bounds
.