There are many things that can cause this shift. Most likely it's mechanical. Figure out which axis it is. There 6 pulleys and tighten the set screws on all 6. Not just the 4 on the long belt - all six. Also your UM should have come with spare set screws. Those are better quality so if after tightening the hell out of those tiny screws, if it still slips you can replace with the newer screws.
Having said that, the second most common problem is that the short belt is touching the wood. While you are printing, look at the short belts (the ones to the steppers). Each time the axis changed direction, does the belt twist? Does it twist a different way each time it changes direction? If so then you are rubbing against the wood. It's subtle and hard to believe but this can cause small amounts of shift on each layer. It's easily fixed by adding washers under the 4 spacers.
There are a few other things that can cause this but these are the most common two. If neither of these fix it, please post your cura settings. You can save your "profile" and post that for us.
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illuminarti 18
The gradual shifting in the Y-axis is probably due to one or other of the pulleys for the y-axis not being tightened properly. Check all the grub screws and make sure they are really tight - including the one on the stepper itself. It can be hard to tell which one is shifting - you can use a sharpie to make a mark on the pulley and shaft in order to better see if one of them is slipping.
What OS are you running Cura on?
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