I have limited experience of what I consider to be modern petrol engines (yep I'm getting old) but whilst living in probably one of the dampest parts of England I used to spend many a happy hour cleaning and driving out muck and moisture from electrical connections with WD40 (Do you get that where you are? It is a sort of multi-purpose light machine oil).
Just keep going with the WD40 you'll probably find the culprit in the end.
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