Recently my rear driver side turning signal stopped working, then the next day before I got a chance to change the bulb it started working again out of nowhere. Dashboard light blinks fast. Right turn signal works just fine. Whats wrong? Please help

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I noticed once it started working again, and I went over a bump in the road it stopped working again. all other lights work, but I have had to change the right front and back turn signal lights previous to this about a month ago. But I figured they just needed change cause we bought the car used and it had been sitting for a while. Could this be a electrical problem or just a problem with that specific turn signal