Both my turn signals will, what appears randomly, flash faster then return to normal. They can repeat this cycle any number of times or not at all. I asked my husband to to check all the lights and he said they all looked fine/worked. So I don'think it's a bad bulb. I want to say that I notice this more idling at a stop light and it's really hot or really cold outside (either 90 degrees F or 32 degrees F).
What could be causing this?