Very Strange. Make sure you're using the proper type of bulbs. Some sockets use 2 filament types. Also, the fact that they started working properly again leads me to believe that there still is a problem with the contacts in the sockets or bulbs. I doubt whether "shocking" the turn signal is knocking out the operation. The resistance of the turn signal is a balanced operation, and if any part of this equation is wrong they'll either flash more quickly, or less quickly, or not at all. The turn signal bulbs have bayonet bases with uneven tangs to prevent you from putting them in backwards. If by chance you forced them into the socket the contacts will not line up and thereby prevent a good contact. I think that Radio Shack sells a spray on contact cleaner & conditioner. I use "Caig Brand ProGold G5 Spray" for certain electronic components......but this product is pretty expensive.