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Flasher relays/units are normally a thermal device, whereby a bimetal element is heated, bends to move a contact, breaks the contact, and the cycle repeats.
It is interesting that the original query introduced ambient temperature into the equation. It could be that this is in effect relevant. But whatever, the flasher relay/unit is the suspect item.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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