I've never had such a system. But from experience whenever something suddenly goes awry and the adjustment screws do exactly what you're describing. It's time to take a step back, take a breath and figure out what is actually going wrong to cause the adjustments to wander so much. Something is loose or a mounting point is rotting and not secured or ??? Take a careful look at it while in operation and you'll hopefully spot what is wrong that's causing this.
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