I am amassing my fleet of Benchy's trying to troubleshoot my printer. Of the last 7 (soon to be 8) only one large issue sometimes occurs, there is a shift along the x-axis (+) that, when it happens, always occurs at a 31mm height. This happens for about 2/3 prints. I'm kinda stumped, as by this time the printer bed has cycled through that area 100+ times so I wouldn't think it would be a belt issue or I would expect it to occur more "randomly". I thought maybe it was an issue with the stepper driver current, but it happens at the same height on both 0.2mm and 0.12mm layer thickness prints. My (potentially faulty) logic was that if it was a current issue it should show after a given amount of movement, so lower on the 0.12mm. I've checked all the belts, grub screws, etc. Any ideas?

So this was my first print (and printer) attempt and the results could have been better... Any suggestions from those with experience as to whats causing/how to fix the issues? I am using the 2s dual setup, but only hotend 1 was used and the fan shrouds are currently not on. From what I have read the shifting is typically caused by a mechanical issue, but it didn't really show up until the later portion of the print (about an hour into the print) and a little at the bottom and the splitting is caused by incorrect temps or layer thickness, but I was using the suggested default... Any suggestions would be much appreciated. Thanks.