Do you get any Exception popup messages from the .NET framework when that happens?
If yes there is somekind of problem with a code in the UCCNC or in a plugin.
And then please open the message text and copy it here for me.
If there is no message at all, just the usual Windows application crashed message then the issue is not with the UCCNC, otherwise you would see an exception message.
In that case it will be hard to tell you what the problem is, because it can be a problem with basicly anything, a windows software module problem, e.g. a .NET framework or the C++ resdistributable package corruption or any other Windows problems, a hardware problem, it is then hard to impossible to find that out and probably reinstalling Windows will be what will help.
And we've not heart about this kind of issue, but if anybody has anything similar then please let us know with posting the details...