2001 Toyota 4Runner Relays or signals

I have recently noticed that my signals will not work. I can hear the clicking, but the signal blinks once and stops. This only happens when I turn on the right turn signal. It does not happen all the time. Is this a relay hitting the skids? Normally when my signals blink fast, I check to make sure all the bulbs are good, however, since this is an intermittent problem, I am looking more at a problem with a relay acting goofy versus fuses or bulbls. Any insight to other causes? Thanks.