Sometimes and seemingly randomly, when I save a dxf from a part, the DXF comes out rotated at a random angle. When it happens, I've checked the orientation in views, and the orientation with respect to the main axes, and everything is perfectly aligned, it just seems the DXF export is adding a rotation for no apparent reason.

It's not a huge deal as they can rotate it to the right orientation on the laser, but it is a time consuming annoyance. I've seen it off and on pretty randomly over the past year, with new parts and old parts, no real pattern to it, no settings changed. Has anyone else seen this happen? Any tips to stop it or fix it?