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@TooTallTim
Mine's similar - 95% of the time it's fine, but sudden activity increase sets it off. Gradual increase doesn't though. Overheating sets it off too. In hindsight, cycling probably isn't the wisest thing to be doing, but hey.
I'm not sure where you're based, but if it's heart related then trying to get referred to a Dr Seigel (sp. Will check that again for you) might be worth it. Literally the only doctor I spoke to who actively wanted to sort my problem out.
Hearts>watts.