I have seen a few of these failures and some have been where there was no obvious cause.
Low voltage systems seem worse for it and the consequences are worse as the added resistance often prevents fuses from protecting these situations.
I agree that keeping an eye on it is about all you can do and it serves as a good reminder never to mount any form of connector on wood or other combustible things.
Even bolted or crimp connectors are not foolproof, once resistance develops the whole thing self destructs fairly rapidly.
Flux
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