Bearing issues, y axis getting bound up

I preload my bearings tighten everything in the order I am supposed to and run the break in program. It runs flawlessly the first couple times. Then the y axis bearings start to get tight and then these seize up toward the back end of the table. I’ve tore everything back apart and readjusted bearings leaving them a little looser than before and same results. Looking for ideas to keep this thing rollin. Thanks