Strange issue on outside one one side and only vertically

[TTVert]

So as an update I print3ed another similar box w/ the same settings I've been using for 5+ years problem free and the same issue happened. Oddly (as you'll see in the attached pic) there was about 1" of vertical print that was perfect? It only happens on one side in this one area. Anyone have any input? I also had printed something about the same circumference as this in a different filament the day before and it was fine. Granted it was only a 2mm shell but same circumference which may be the issue here. I just printed a small 20mm calibration cube to see if it would do it there and it did not. I feel it may be a retraction issue at larger distances and it didn't do it w/ the 2mm shell print because it just kept going around and wasn't having to retract and travel a great distance. Not sure though, I'd have to go through the G code to see how it starts next layer. Even if that was it though, why would i have a good 20 or so layers w/ NO defect as shown in pic?