It sounds like a bad turnsignal switch to me, the way you describe it.
May have a bad flasher unit in the under dash fuse box, if all lights are working.
Could be a loose ground wire. Usually connected to a bolt on the frame near the rear axle.
Several possiblities that come mind. Turn signal switch, problem with a weak wire or connection that could be anywhere in circuit including between switch to fuse box to sockets, corrosion in sockets or a flasher or bulb. Sometimes bulbs filiments (the real fine wire you see in the bulb) can be weak braeak away temporarily but re-weld it self until it happens again.
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