Here's the background, while driving last week my turn signals stopped
working. The dashboard indicators showed that they were not working,
and a visual inspection outside the vehicle confirmed it. Midway
through the trip, I checked the fuse. The fuse had not blown. I swapped
it with another fuse of the same type (I think it was for the fog
lights). The signals still did not function. I continued on my trip -
reaching my destination about 250 miles away.

After letting the car sit for about 90 minutes, I hopped back in to
continue my trip. At that point, my turn signals worked again. The turn
signals continued to work for the rest of the weekend, another 350
miles or so, and are still working.

What happened? Should I take this in to the dealership? What should I
suggest that they look for?