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Hi, I am Mike, welcome. I'm reviewing your question.
It sounds to me as though your mechanics are not checking and finding the problem and just throwing parts at it. Any front end mechanic should be able to show you what is loose or worn out. If it is in the steering system, you should be able to turn the steering wheel left and right and have over a few inches of play in the steering wheel before the front tires begin to move and if so look at the steering parts until you find out the spot where something moves while turning the steering wheel and then all of a sudden something don't.
If it's in the suspension, then using a long pry bar while the vehicle is off the ground, with the suspension hanging free and no compression on the springs.
Don't ignore the rear axle, too. If it's loose it could cause the same things.
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