Hey there @Print1! Welcome back to the community! From what it looks like, the walls are entirely intact, so it’s not likely the fracturing being the problem, it’s that the building doesn’t seem properly anchored.
Here is a thread that goes over having the same issue but shows a method to properly anchor the building so that it will only begin falling apart once fracturing begins:
If you haven’t started using fields yet, they are a prerequisite to understanding that tutorial: