Why temperature range for Cube Orange is only -10 to +55C

Why in Cube Orange specification they have mentioned operating temperature is limited -10 to +55 C even if all components used in cube are rated 85 and above? Mainly CPU and IMU both are rated above 85.
What is the maximum limit of operating temperature of cube where it fails. I am facing the issue in delay in communication when enclosure temperature is exceeding ~+70C also loss in the serial communication.

Highly recommend keeping within the temperature bounds given by CubePilot. You may need to install a cooling fan near the cube orange to mitigate this issue.