So what we would usually call a 'loose connection'?
Is not the main problem (and potential fire risk) due to such an issue due to the overheating (which you report) due to the high resistance/impedance connection, rather than any arcing which occurs (which presumably requires transient total disconnection of the conductor?) ?
In any event, since you reported that this did not cause the AFDD to operate, that presumably brings into question whether such things are much use, anyway, doesn't it?
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