I figured it out ! It's not a geany issue, but a gvfs issue ! If I do killall gvfsd when then hangup happens, and then reopen the same network folder, I can save the file immediately, and geany becomes responsive again ! I think it's safe to say, it's more of a gvfs issue, then a geany issue. Geany just can't communicate with the resource's original location, and as such, becomes unresponsive.
Thank you !