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I have an ultrabase bed and it seems fine. I even printed new holders for the bed, and I still have the same issue. I changed the bed (for a glass one) and no luck.
Regarding the screws, I checked them, they are tight, I checked the brass thingies and they are fine, however, i notice some movement between the ball and the ring of the rod on one of the rods (I don't know how to explain this). This is why I suspect the rods. Regarding the carriages, I don't know, they seem tight so I would expect them to be OK. Anyway if I would find replacement parts, I would replace at this stage everything, including the carriages, effector and rods.