G ... interesting this. I have been running my Speed Passion stuff for around a year now with no issues at all. I only have 2 motors that I use (8.5 and 6.5) and they sometimes get swapped between the cars regularly but sometimes are left in for months at a time too. My cars are always commented on as "being a bit hot" as I have found the Speed Passion stuff likes to be geared a touch higher than most so if it was heat then I would have had a failure by now I am sure!
Only thing I could think of that is different between our two situations is that you run a cat with it's 'alternative' motor mounting method and that could be putting different vibration signitures into the connectors.
Do you have the wires tied down or free to wiggle about? I always keep my wires tethered so there is no relative movement at the connector, originally I was concerned about a connector falling out but they have always been rock solid ... actually sometimes VERY stiff to remove.
Hope you find the root cause.
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