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Pixhawk CUBE 2 Getting Hot/Burnt?

Guys, yesterday after many successful flights I have decided to take another one, and device smoked a little bit, but I was not sure as Raspberry, my Laptop 2 different batteries were connected to the device, so I was not sure which one was the cause. Today, I have been trying to connect to the Pixhawk Cube 2 with my laptop, with another one, whether it is Mission Planner or QGroundControl, I have a port problem saying it can not connect it. I have tried different ports, AUTO Connection, however, the result is the same. Can it be the reason of my CUBE 2 was burnt out?

That would be very strange if the Cube itself had a power fault like that.
Disconnect all acessories including the power connector and try it with just USB.

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