TAZ 5 Printer Issues

I have been printing on this machine for 4 years. I have had issues with the y axis bearing housing cracking, but have never seen an issue I could not figure out. The print starts fine for the first few layers, usually till an infill starts, then starts to wobble and over extrude. I have changed the filament, nozzle, tighten all screws, realigned z axis, tightened belts, and leveled bed over and over.

pic attached.
Any feedback would be appreciated.

JIC - I am ordering parts to upgrade the the x-axis to 12mm rods.