When I start printing, the print gets to about 8 layers. Then the y axis crashes to the back and X to the left. This happens when I use Cura. When I use Slic3r then it doesn't do that. The Cura worked fine previously. What could cause this.

Hi,

Maybe you need to uninstall Cura
and do a new installation.

++JM

What printer electronics and firmware are you using?

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

I am using ramps electronics and Marlin.