In cases where things like this seem randomly occurring, I've often found it to be moisture related. So I'm wondering if, in a combo situation, you have some sloppy installation work on receptacles etc., but when perfectly dry, the circuit works as it should. However when it gets a little moisture involved, for example when the dishwasher runs and steams, or they boil water in the microwave, or maybe even poorly installed vapor barriers, shorts take place that then, once they happen, immediately vaporize the cause and return to normal.
A quick way to check this is to spray the receptacles down with WD-40, which will separate the water molecules to eliminate conduction. It will last for a week or so. If the tripping stops, you've proved the concept. Fixing it may present a whole new set of issues, but st least you know. Conversely if it makes NO difference, you've eliminated a possibility at little cost.
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Many people are shocked when they discover I am not a good electrician...
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