I had this exact same problem until one day my turn signals quit working completely. At first it would click rapidly, so I replaced all the lights just to be sure. Then the clicking sound would continue after I turn off the switch. So I replaced the hazard switch. Stopped the continued clicking for a bit but it was still rapid. So I just delt with it for a while until it started up again. Then one day, they just stopped working all together. Replaced hazard switch yet again, but with a different brand and now it works perfectly. No rapid clicking, and no continued clicking. The part is super easy to do. Took all of 5 minutes in the parking lot of Autozone.
Yes, most likely the hazard switch is the culprit. It should have a built-in relay.
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