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Can you see if there are any score marks on the shaft? All the way down or only partially?
Are these HWH jacks? This can be from a damaged shaft or a bad solenoid.
They sell jacks on an exchange basis. I would take a close look the next time you put them down and see if you see any heavy scratches on the shaft. That is an indicator of something in the bearing suface. If you see none then it may be a bad solenoid on that jack.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?
O.K.............I am here every day and will watch for your post.