Help: Why are my Little Bee 20a ESC's bursting into flames ?

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It's nice to go from a nicely flying with a small issue to a bunch of wires an electronics stuck in the corner with the smell of magic smoke all the time wishing you had a time machine to hand.
If anyone can give any reasonable reasons why 2 ESCs went up in flames, I'd really love to know. I'm not a fan of fires on my desk, and would like to avoid them in the future !
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