Nokia OZO camera Manual page 31

Capture or broadcast will stop on overheat.
The Device is protected against overheating
by switching to standby when the temperature
of the device exceeds a set limit (A).
Switching to standby discontinues any kind of
capturing because the sensors are powered
down.
If the temperature continues to rise even after
switching to standby a second threshold
triggers full shutdown (B).
Do not use near heat sources.
These may cause the device to overheat, and
stop capture.
Temperature Temperature