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I too would start with looking at the adjustment of the slide. Even though it doesn't feel its out of alignment but might be just enough to cause the problems your seeing. I'm guessing the problem is when you are moving that dirt is getting in. After having your alignment checked, look at the seals....I would even chalk the seals and see if there is a visible gap. Sounds to me a seal isn't sealing and dirt is rolling in.
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