Prints "Catching Up" On Qss-3312

[BayCameraCo]

I am having an issue where the 4" prints almost catch up with one another. It is only on the 4", 5" and 8" are ok as they come up the middle instead of side by side like the 4". It is not consistent, sometimes it is on the right side and sometimes on the left. Saturday we printed over 800 prints and it only happened a few times. Today we printed over 900 and it was more frequent. I think the issue lies with the #3 and 4 crossovers. Sometimes the #3 one will skip and not turn as smoothly and the #4 one is a little stiff but still turns. I am thinking of replacing all the "guts" on both. New rollers, gears, bearings and clips. Anyone else with this issue before? Any input is appreciated. Many thanks!