If these connectors are loose, they won't carry the current very well either.. This will in turn generate heat, and probably end in
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Glueing?, thread locking?, blue tacking isn't a solution. If the connectors are loose, I'd maybe try some new connectors on the ends of your wires as the ones you have may be over size (someone on here may be able to confirm the exact internal diameter of some which do fit snug for you to check), if not and you have only just brought it, I'd take it back.