CrealityScan 4 1.3.7 main screen keeps changing size back and forth

Has anyone else experienced this? While scanning the main gray display area keeps flipping back and forth so that Project column and top row with icons “New scan”, “Preview”, … disappears and then comes backs again. Extreamly irritating as it causes everything to jump around on screen. Note that I’m not touching keyboard or mouse. Just hold scanner over object.