Unresolved Print did this after a good start......then.....

I'm using an R1 Plus that I've had for many years now. Various fixes here and there. It's one of 3 of them I own. But it's been a while since I've seen this happen. I totally forgot was causes the print to shift once it's started and printing. (sticks to the print bed just fine) This happened roughly an hour into the print. That is suppose to be a rectangle box. You can see it shifted, not once, but twice.

It's not the file either since I have many successful prints of this model. Thank you for any assistance .

Mike