Click the "Recalibrate" button in the bottom left (transparent button over the camera image)

This happens when your lighting changes. LASR X requires consistent lighting (other than laser impacts) to work reliably. Frequently, LASR X can recognize lighting changes that don't look like laser impacts and suggest that you recalibrate, but not always.

If you are seeing this a lot:

Most commonly: The targets and webcam are wobbling/moving around, and that the shooters or their shadows may be moving between the webcam and the targets.

Back-lighting: Results in the shooter, or something or someone else, casting shadows over the targets. Those shadows cause changing light conditions. Therefore, you will want to remove the back-lighting source or use additional fill lighting to eliminate the shadows.

Natural lighting: The sun dominates the light in the room in this condition. As the sun moves throughout the day, light levels in the room and on your targets change accordingly. You will want to take steps to eliminate this source of changing light, like closing curtains or even moving to a different room.