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I found another related cause to watch out for - this might help others with a similar issue.

I, too, replace the cheap balls with drylin, things got much smoother, but was getting vibrations from time to time after refit assemblies...
Until the last time, loosening and gradually tightening the mounting screws on the Y-Axis bearings did the trick.

This also helped with a vibration problem I noted on the X-Axis with the drylin bearings.

Last time, though, after 3 times removing the hot bed and re-doing the bearings it was still groaning on low speeds...
The problem this time... When I re-tightened the threaded rods, I got one too tight - enough to just slightly bow the guide rod next to the one where the nut was in the wrong place.

Whether it is the bearing mount alignment, or the separation of the rods, the vibration happens as one side binds up and the other slips - and then it binds up while the first one slips... All the while printing waves on the walls of the thing you are printing.

I re-adjusted so the guide rod was straight but not bowed, yet had no play along its length. Back to clean and happy prints!

Oh -- also -- Thanks for posting that your problem was solved - and how... There isn't enough of that here.