UE 5.1 Crashing randomly when moving objects in the world

Hello!
Im having an issue where the engine keeps Crashing when im moving Objects in the world.
it’s a map that never gave me any issues. today i had to change some things and the engine just crashes. i move a rock to the left crash. move a rock to the right crash.
i have the lastest Nvidia Drivers. tried restoring the Nvidia panel UE settings to default. no luck.
any idea what it might be?
i can play the game. i can edit BP’s it just crashes when i move stuff around the map or editing the terrain