@ahoeben I can't tell if it always occurs at the same interval. The cause has not been one particular gcode file. This occurs on any and every gcode file on this machine. Roughly 5 to 10 minutes into any print motors go into maximum overdrive w/ high pitch squealing, smashing into one or more limits for roughly 15 seconds or so, then resumes printing normally but shifted over a bit from its original orientation.
I'm running the latest stable Ultimaker Cura on macOS (10.13.6) and always properly eject my SD cards.
I checked the connections from front control board to the main board and all are tight. I cleaned out the SD slot w/ compressed air and still have the same issue.
Anyone have other procedures or suggestions? Is there an official replacement control board and/or mainboard? I've only seen the cheap knock offs and would like to make sure I'm using legit parts if I end up needing to replacing anything.