It's possible that the lens has been knocked out of focus. See @Dobry-Kolacz 's write-up here on addressing that issue: https://forum.modalai.com/topic/1362/sentinel-stereo-camera-calibration-inconsistency/4?_=1674364904154
"To adjust the focus on our stereo cameras twist the lens housing clockwise or counterclockwise similarly to how you would on a DSLR lens. Look closely at the stereo cams and you will see 4 flat edges. I recommend using a 6mm wrench to engage 2 of the flat edges; from there you'll be able to rotate and adjust the lens as needed. It is possible to use something like tweezers or small pliers to accomplish this however I recommend against that method because it is too easy for the tool to slip off and end up scratching the lens.
To clean the lens I recommend using a clean microfiber cloth, a lens tissue, or a fresh q-tip"