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Could your kitchen waste u-bends be at fault? There will be one (or two) under the sink and another for dishwasher and washing machine. If not installed correctly (correct height of upstand, depth of u-bend, height above ground of trap etc, passage of water through some of the waste pipes may suck some or all of the water out of the u-bend trap, allowing foul odours in.
Pouring test water through will not necessarily reveal this as it will simply fill the bend at that moment but use of the appliances or a full sink emptying might create a partial vacuum again.
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