Coolant Overheat

The engine should always be 100% full.
When working properly, the Coolant Reservoir Bottle should refill the engine 100% after every flight.
A slow leak in the engine should have drained the bottle.
You have 2 leaks, and one of them is in the hose from the base from the Radiator Cap to the Bottle.
This hose must be Vacuum Tight at the Radiator Cap and extend to the very BOTTOM of the bottle for the system to work properly.

Be sure you understand how this system works or you will be chasing your tail.
It is NOT a simple bottle to catch overflows and prevent dripping.
The bottle fills and drains every time you run the engine.

Here is an example (begin around minute 4:30) of how NOT to hook up the overflow bottle!

https://www.youtube.com/watch?v=2yDh3H58uAI