Timelapse Help soft/unfocused images

Looking for some advice or if anyone knows what I'm doing wrong. I recently switched from canon to sony a7rii and have been shooting with the zeiss 24-70 f/4. One issue that I've run into on a few ruined landscape timelapses is that somewhere after 10-100 photos the camera seems to readjust the focus and then the rest of my 100-500 images are out of focus slightly and soft for the rest of the duration. I typically shoot in aperture priority or manual depending on the time of day, but I have no idea what is going on from focusing and clicking start on my intervalometer to the when the images become unfocused. I haven't tried switching the focus to manual which I imagine will fix the issue, but if anyone else out there knows of a setting I need to change as well for timelapsing (perhaps image stabilization?) that would really help as I'm not used to such a sophisticated camera yet that may have other hidden settings to shut off.