I experiment several times issue about images. Let's suppose to have an images, or example composed with a few lines. Everything's fine. Whenever I zoom out over a treshold some or all lines disappear. Sometimes I have this issue even I don't zoom out but just move the cam. You can take a look at the red segments before and after cam moving.
Can I fix it?
The simplest and most certain way to solve all similar problems, is to open the SVG and add a transparent circle around the existing art. The circle (or ellipse should be about twice as large as the existing art. The circle should be a filled path with no stroke, and it should have an opacity of 0%. Then save the new SVG with a different name, delete the old svg from the scribe and add the new SVG.
Possibly your default quality setting is also too high. 1200-2400 might be a good setting.
Hope that helps,
Mike (videoscribe user)