If you happen to have an old copy of Hexagon 1.21, it is rock solid. And is my go-to prop modeling program.Hexagon is truly flaky for some people and fairly solid for others. I don't think anyone has ever figured out why.
One thing is the memory limitation in any 32 bit program and with a model that can climb fast, it seems to get flakier by the polygon/smoothing operation.
It was always solid for me when I used it, but I just happened to be one of the lucky ones.
One thing that always frustrated me though was if you make an error (like a manifold poly) Hexagon doesn't warn - it just crashes to the desktop. And, hidden "secrets" that aren't documented - like escaping from an extrude operation requires 2 "undos" or you end up with a bad model and crash.
If you happen to have an old copy of Hexagon 1.21, it is rock solid. And is my go-to prop modeling program.
Hexagon 2.0, when released was very flaky, mainly showing up when using the ZBrush like smoothing and morphing features. I already had ZBrush so that wasn't a big feature for me, personally.
2.1 was released around 30 days of the 2.0 release and (IMO) is the most stable of the newer Hex releases, won't work in Studio's GoHex, but that's no great loss.
Hex does have the "figure bloat problem" for models containing multiple objects, however, this is easily taken care of by selecting all objects and merging duplicate UV's.
I often wonder what might have happened if Daz had kept Thomas and the French crew around long enough for a second bug fix release.