As soon as they begin to rise, mountains are subject to erosion. They are subject to erosion, mainly under the direct or indirect effect of water or ice during glacial periods.
It is very difficult to know how much “rock bridge” holds a rock mass.
It is rare for a large mass of several thousand cubic meters to fall suddenly without a warning sign.
Erosion in slideshow:
A link to go further: ISearth, Geophysics of Seismic and Gravity Risks