Y axis slipping at coupler

just finished building my 3018-pro and started my first carve. everything appeared to be going ok when i started hearing a grinding noise. while investigating i noticed that the Y axis was not rotating while the coupler was moving. i tried tightening the coupler and even replacing with the spare i had on hand, this did not resolve the issue. i also tried a light machine oil on the guide rails and the table. again this did not resolve the issue. any ideas?

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