1966 C10 Turn signal question and issue

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Hey All,
I replaced my turn signal switch recently and also the plastic return piece on the back of the steering wheel as well with a NOS one. I have had 2 new turn signal switches installed in the last 6 months... both are acting up. Half the time they do not want to work, and my mechanic told me that his supplier told him this is a normal thing that they are finicky and never ever really worked correctly.... is anyone else having this issue? What can I do to resolve it? Is there some trick I am missing to correct this? Let me know. thanks