sculpted terrain edge, player disappears after few seconds

I have heavily sculpted terrain, I did some on very edge of terrain to give some unique shap3e vs squre, yet when I tried to play on downwardly sculpted terrain, player disappears very quickly after just a few seconds of descension on new terrain layout from sculpting down a ways… ( that is now a lot lower than before).is this a engine failure or ???

sorry fixed sigh.
I may have somehow altered by keystroke, KILL value. Lowered enough to get to altered edge and all is fine.

cheers