According to the dictionary, "hang" can also be used as a noun, but I don't think it is the right word to use in this scenario. Should I use "hanging" instead, e.g., this software bug may cause two problems to this computer, crash or hanging? It also sounds weird to me.
In general, if a verb doesn't have a direct corresponding noun, what should I do if I have to use a noun to present the same meaning.
Best Answer
You could say "a freeze", but "a hang" is also perfectly acceptable.
As a matter of fact the title of the wikipedia article "Freeze_(Computing)" is actually... "Hang" and starts like this
(emphasis is mine)
Personally I would prefer to use a "hang" for a server (typically in the case when a request is sent and one waits indefinitely for the answer) whereas the "freeze" conjures up the idea of an unresponsive GUI (when for instance moving the mouse does not move the pointer) and would therefore preferably apply to a desktop.