Oxen stopping over and over.

I seem to have issues every now and then with my oxen in fields. I guess more so my issue is with the worker associated with the oxen. They will do a half pass in one row of my field and then walk back to the farm, turn around, and head back to the ox. Travel another 20-40 feet with the ox and then repeat. Meanwhile on my other fields, oxen are ripping up and down with no stops…. Ultimately not game breaking or anything like that, just very confusing as I can’t find a reason that it happens, somewhat consistently.