Inventor Crashes

[JD Mather]

Your first sketch is not fully constrained.
You should not repeat dimensions, use equal = contraints in place of repeated dimensions.

You should not repeat sketch geometry (in most cases, and this is one of them).
Do an experiment - right click while in this sketch and select Show All Constraints.

The better method would be to create one hole (or typical geometry) and the Pattern Feature.
It is usually better to patter a feature than to pattern a sketch to reduce the number of geometry constraints.

http://home.pct.edu/~jmather/skillsusa%20university.pdf